diff --git a/proto/api/v1/instance_service.proto b/proto/api/v1/instance_service.proto
index b2e6c641a..b9c096ad6 100644
--- a/proto/api/v1/instance_service.proto
+++ b/proto/api/v1/instance_service.proto
@@ -71,6 +71,7 @@ message InstanceSetting {
     StorageSetting storage_setting = 3;
     MemoRelatedSetting memo_related_setting = 4;
     TagsSetting tags_setting = 5;
+    NotificationSetting notification_setting = 6;
   }
 
   // Enumeration of instance setting keys.
@@ -84,6 +85,8 @@ message InstanceSetting {
     MEMO_RELATED = 3;
     // TAGS is the key for tag metadata.
     TAGS = 4;
+    // NOTIFICATION is the key for notification transport settings.
+    NOTIFICATION = 5;
   }
 
   // General instance settings configuration.
@@ -174,6 +177,25 @@ message InstanceSetting {
   message TagsSetting {
     map<string, TagMetadata> tags = 1;
   }
+
+  // Notification transport configuration.
+  message NotificationSetting {
+    EmailSetting email = 1;
+
+    // Email delivery configuration for notifications.
+    message EmailSetting {
+      bool enabled = 1;
+      string smtp_host = 2;
+      int32 smtp_port = 3;
+      string smtp_username = 4;
+      string smtp_password = 5;
+      string from_email = 6;
+      string from_name = 7;
+      string reply_to = 8;
+      bool use_tls = 9;
+      bool use_ssl = 10;
+    }
+  }
 }
 
 // Request message for GetInstanceSetting method.
diff --git a/proto/gen/api/v1/instance_service.pb.go b/proto/gen/api/v1/instance_service.pb.go
index 2dc3e0094..0ffbfd228 100644
--- a/proto/gen/api/v1/instance_service.pb.go
+++ b/proto/gen/api/v1/instance_service.pb.go
@@ -37,6 +37,8 @@ const (
 	InstanceSetting_MEMO_RELATED InstanceSetting_Key = 3
 	// TAGS is the key for tag metadata.
 	InstanceSetting_TAGS InstanceSetting_Key = 4
+	// NOTIFICATION is the key for notification transport settings.
+	InstanceSetting_NOTIFICATION InstanceSetting_Key = 5
 )
 
 // Enum value maps for InstanceSetting_Key.
@@ -47,6 +49,7 @@ var (
 		2: "STORAGE",
 		3: "MEMO_RELATED",
 		4: "TAGS",
+		5: "NOTIFICATION",
 	}
 	InstanceSetting_Key_value = map[string]int32{
 		"KEY_UNSPECIFIED": 0,
@@ -54,6 +57,7 @@ var (
 		"STORAGE":         2,
 		"MEMO_RELATED":    3,
 		"TAGS":            4,
+		"NOTIFICATION":    5,
 	}
 )
 
@@ -263,6 +267,7 @@ type InstanceSetting struct {
 	//	*InstanceSetting_StorageSetting_
 	//	*InstanceSetting_MemoRelatedSetting_
 	//	*InstanceSetting_TagsSetting_
+	//	*InstanceSetting_NotificationSetting_
 	Value         isInstanceSetting_Value `protobuf_oneof:"value"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
@@ -348,6 +353,15 @@ func (x *InstanceSetting) GetTagsSetting() *InstanceSetting_TagsSetting {
 	return nil
 }
 
+func (x *InstanceSetting) GetNotificationSetting() *InstanceSetting_NotificationSetting {
+	if x != nil {
+		if x, ok := x.Value.(*InstanceSetting_NotificationSetting_); ok {
+			return x.NotificationSetting
+		}
+	}
+	return nil
+}
+
 type isInstanceSetting_Value interface {
 	isInstanceSetting_Value()
 }
@@ -368,6 +382,10 @@ type InstanceSetting_TagsSetting_ struct {
 	TagsSetting *InstanceSetting_TagsSetting `protobuf:"bytes,5,opt,name=tags_setting,json=tagsSetting,proto3,oneof"`
 }
 
+type InstanceSetting_NotificationSetting_ struct {
+	NotificationSetting *InstanceSetting_NotificationSetting `protobuf:"bytes,6,opt,name=notification_setting,json=notificationSetting,proto3,oneof"`
+}
+
 func (*InstanceSetting_GeneralSetting_) isInstanceSetting_Value() {}
 
 func (*InstanceSetting_StorageSetting_) isInstanceSetting_Value() {}
@@ -376,6 +394,8 @@ func (*InstanceSetting_MemoRelatedSetting_) isInstanceSetting_Value() {}
 
 func (*InstanceSetting_TagsSetting_) isInstanceSetting_Value() {}
 
+func (*InstanceSetting_NotificationSetting_) isInstanceSetting_Value() {}
+
 // Request message for GetInstanceSetting method.
 type GetInstanceSettingRequest struct {
 	state protoimpl.MessageState `protogen:"open.v1"`
@@ -836,6 +856,51 @@ func (x *InstanceSetting_TagsSetting) GetTags() map[string]*InstanceSetting_TagM
 	return nil
 }
 
+// Notification transport configuration.
+type InstanceSetting_NotificationSetting struct {
+	state         protoimpl.MessageState                            `protogen:"open.v1"`
+	Email         *InstanceSetting_NotificationSetting_EmailSetting `protobuf:"bytes,1,opt,name=email,proto3" json:"email,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *InstanceSetting_NotificationSetting) Reset() {
+	*x = InstanceSetting_NotificationSetting{}
+	mi := &file_api_v1_instance_service_proto_msgTypes[10]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *InstanceSetting_NotificationSetting) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InstanceSetting_NotificationSetting) ProtoMessage() {}
+
+func (x *InstanceSetting_NotificationSetting) ProtoReflect() protoreflect.Message {
+	mi := &file_api_v1_instance_service_proto_msgTypes[10]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InstanceSetting_NotificationSetting.ProtoReflect.Descriptor instead.
+func (*InstanceSetting_NotificationSetting) Descriptor() ([]byte, []int) {
+	return file_api_v1_instance_service_proto_rawDescGZIP(), []int{2, 5}
+}
+
+func (x *InstanceSetting_NotificationSetting) GetEmail() *InstanceSetting_NotificationSetting_EmailSetting {
+	if x != nil {
+		return x.Email
+	}
+	return nil
+}
+
 // Custom profile configuration for instance branding.
 type InstanceSetting_GeneralSetting_CustomProfile struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
@@ -848,7 +913,7 @@ type InstanceSetting_GeneralSetting_CustomProfile struct {
 
 func (x *InstanceSetting_GeneralSetting_CustomProfile) Reset() {
 	*x = InstanceSetting_GeneralSetting_CustomProfile{}
-	mi := &file_api_v1_instance_service_proto_msgTypes[10]
+	mi := &file_api_v1_instance_service_proto_msgTypes[11]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -860,7 +925,7 @@ func (x *InstanceSetting_GeneralSetting_CustomProfile) String() string {
 func (*InstanceSetting_GeneralSetting_CustomProfile) ProtoMessage() {}
 
 func (x *InstanceSetting_GeneralSetting_CustomProfile) ProtoReflect() protoreflect.Message {
-	mi := &file_api_v1_instance_service_proto_msgTypes[10]
+	mi := &file_api_v1_instance_service_proto_msgTypes[11]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -913,7 +978,7 @@ type InstanceSetting_StorageSetting_S3Config struct {
 
 func (x *InstanceSetting_StorageSetting_S3Config) Reset() {
 	*x = InstanceSetting_StorageSetting_S3Config{}
-	mi := &file_api_v1_instance_service_proto_msgTypes[11]
+	mi := &file_api_v1_instance_service_proto_msgTypes[12]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -925,7 +990,7 @@ func (x *InstanceSetting_StorageSetting_S3Config) String() string {
 func (*InstanceSetting_StorageSetting_S3Config) ProtoMessage() {}
 
 func (x *InstanceSetting_StorageSetting_S3Config) ProtoReflect() protoreflect.Message {
-	mi := &file_api_v1_instance_service_proto_msgTypes[11]
+	mi := &file_api_v1_instance_service_proto_msgTypes[12]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -983,23 +1048,141 @@ func (x *InstanceSetting_StorageSetting_S3Config) GetUsePathStyle() bool {
 	return false
 }
 
+// Email delivery configuration for notifications.
+type InstanceSetting_NotificationSetting_EmailSetting struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Enabled       bool                   `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	SmtpHost      string                 `protobuf:"bytes,2,opt,name=smtp_host,json=smtpHost,proto3" json:"smtp_host,omitempty"`
+	SmtpPort      int32                  `protobuf:"varint,3,opt,name=smtp_port,json=smtpPort,proto3" json:"smtp_port,omitempty"`
+	SmtpUsername  string                 `protobuf:"bytes,4,opt,name=smtp_username,json=smtpUsername,proto3" json:"smtp_username,omitempty"`
+	SmtpPassword  string                 `protobuf:"bytes,5,opt,name=smtp_password,json=smtpPassword,proto3" json:"smtp_password,omitempty"`
+	FromEmail     string                 `protobuf:"bytes,6,opt,name=from_email,json=fromEmail,proto3" json:"from_email,omitempty"`
+	FromName      string                 `protobuf:"bytes,7,opt,name=from_name,json=fromName,proto3" json:"from_name,omitempty"`
+	ReplyTo       string                 `protobuf:"bytes,8,opt,name=reply_to,json=replyTo,proto3" json:"reply_to,omitempty"`
+	UseTls        bool                   `protobuf:"varint,9,opt,name=use_tls,json=useTls,proto3" json:"use_tls,omitempty"`
+	UseSsl        bool                   `protobuf:"varint,10,opt,name=use_ssl,json=useSsl,proto3" json:"use_ssl,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) Reset() {
+	*x = InstanceSetting_NotificationSetting_EmailSetting{}
+	mi := &file_api_v1_instance_service_proto_msgTypes[14]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InstanceSetting_NotificationSetting_EmailSetting) ProtoMessage() {}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) ProtoReflect() protoreflect.Message {
+	mi := &file_api_v1_instance_service_proto_msgTypes[14]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InstanceSetting_NotificationSetting_EmailSetting.ProtoReflect.Descriptor instead.
+func (*InstanceSetting_NotificationSetting_EmailSetting) Descriptor() ([]byte, []int) {
+	return file_api_v1_instance_service_proto_rawDescGZIP(), []int{2, 5, 0}
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetEnabled() bool {
+	if x != nil {
+		return x.Enabled
+	}
+	return false
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetSmtpHost() string {
+	if x != nil {
+		return x.SmtpHost
+	}
+	return ""
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetSmtpPort() int32 {
+	if x != nil {
+		return x.SmtpPort
+	}
+	return 0
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetSmtpUsername() string {
+	if x != nil {
+		return x.SmtpUsername
+	}
+	return ""
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetSmtpPassword() string {
+	if x != nil {
+		return x.SmtpPassword
+	}
+	return ""
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetFromEmail() string {
+	if x != nil {
+		return x.FromEmail
+	}
+	return ""
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetFromName() string {
+	if x != nil {
+		return x.FromName
+	}
+	return ""
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetReplyTo() string {
+	if x != nil {
+		return x.ReplyTo
+	}
+	return ""
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetUseTls() bool {
+	if x != nil {
+		return x.UseTls
+	}
+	return false
+}
+
+func (x *InstanceSetting_NotificationSetting_EmailSetting) GetUseSsl() bool {
+	if x != nil {
+		return x.UseSsl
+	}
+	return false
+}
+
 var File_api_v1_instance_service_proto protoreflect.FileDescriptor
 
 const file_api_v1_instance_service_proto_rawDesc = "" +
 	"\n" +
-	"\x1dapi/v1/instance_service.proto\x12\fmemos.api.v1\x1a\x19api/v1/user_service.proto\x1a\x1cgoogle/api/annotations.proto\x1a\x17google/api/client.proto\x1a\x1fgoogle/api/field_behavior.proto\x1a\x19google/api/resource.proto\x1a\x17google/type/color.proto\x1a google/protobuf/field_mask.proto\"\x8c\x01\n" +
+	"\x1dapi/v1/instance_service.proto\x12\fmemos.api.v1\x1a\x19api/v1/user_service.proto\x1a\x1cgoogle/api/annotations.proto\x1a\x17google/api/client.proto\x1a\x1fgoogle/api/field_behavior.proto\x1a\x19google/api/resource.proto\x1a google/protobuf/field_mask.proto\x1a\x17google/type/color.proto\"\x8c\x01\n" +
 	"\x0fInstanceProfile\x12\x18\n" +
 	"\aversion\x18\x02 \x01(\tR\aversion\x12\x12\n" +
 	"\x04demo\x18\x03 \x01(\bR\x04demo\x12!\n" +
 	"\finstance_url\x18\x06 \x01(\tR\vinstanceUrl\x12(\n" +
 	"\x05admin\x18\a \x01(\v2\x12.memos.api.v1.UserR\x05admin\"\x1b\n" +
-	"\x19GetInstanceProfileRequest\"\xfe\x11\n" +
+	"\x19GetInstanceProfileRequest\"\x9e\x16\n" +
 	"\x0fInstanceSetting\x12\x17\n" +
 	"\x04name\x18\x01 \x01(\tB\x03\xe0A\bR\x04name\x12W\n" +
 	"\x0fgeneral_setting\x18\x02 \x01(\v2,.memos.api.v1.InstanceSetting.GeneralSettingH\x00R\x0egeneralSetting\x12W\n" +
 	"\x0fstorage_setting\x18\x03 \x01(\v2,.memos.api.v1.InstanceSetting.StorageSettingH\x00R\x0estorageSetting\x12d\n" +
 	"\x14memo_related_setting\x18\x04 \x01(\v20.memos.api.v1.InstanceSetting.MemoRelatedSettingH\x00R\x12memoRelatedSetting\x12N\n" +
-	"\ftags_setting\x18\x05 \x01(\v2).memos.api.v1.InstanceSetting.TagsSettingH\x00R\vtagsSetting\x1a\xca\x04\n" +
+	"\ftags_setting\x18\x05 \x01(\v2).memos.api.v1.InstanceSetting.TagsSettingH\x00R\vtagsSetting\x12f\n" +
+	"\x14notification_setting\x18\x06 \x01(\v21.memos.api.v1.InstanceSetting.NotificationSettingH\x00R\x13notificationSetting\x1a\xca\x04\n" +
 	"\x0eGeneralSetting\x12<\n" +
 	"\x1adisallow_user_registration\x18\x02 \x01(\bR\x18disallowUserRegistration\x124\n" +
 	"\x16disallow_password_auth\x18\x03 \x01(\bR\x14disallowPasswordAuth\x12+\n" +
@@ -1042,13 +1225,29 @@ const file_api_v1_instance_service_proto_rawDesc = "" +
 	"\x04tags\x18\x01 \x03(\v23.memos.api.v1.InstanceSetting.TagsSetting.TagsEntryR\x04tags\x1ab\n" +
 	"\tTagsEntry\x12\x10\n" +
 	"\x03key\x18\x01 \x01(\tR\x03key\x12?\n" +
-	"\x05value\x18\x02 \x01(\v2).memos.api.v1.InstanceSetting.TagMetadataR\x05value:\x028\x01\"P\n" +
+	"\x05value\x18\x02 \x01(\v2).memos.api.v1.InstanceSetting.TagMetadataR\x05value:\x028\x01\x1a\xa3\x03\n" +
+	"\x13NotificationSetting\x12T\n" +
+	"\x05email\x18\x01 \x01(\v2>.memos.api.v1.InstanceSetting.NotificationSetting.EmailSettingR\x05email\x1a\xb5\x02\n" +
+	"\fEmailSetting\x12\x18\n" +
+	"\aenabled\x18\x01 \x01(\bR\aenabled\x12\x1b\n" +
+	"\tsmtp_host\x18\x02 \x01(\tR\bsmtpHost\x12\x1b\n" +
+	"\tsmtp_port\x18\x03 \x01(\x05R\bsmtpPort\x12#\n" +
+	"\rsmtp_username\x18\x04 \x01(\tR\fsmtpUsername\x12#\n" +
+	"\rsmtp_password\x18\x05 \x01(\tR\fsmtpPassword\x12\x1d\n" +
+	"\n" +
+	"from_email\x18\x06 \x01(\tR\tfromEmail\x12\x1b\n" +
+	"\tfrom_name\x18\a \x01(\tR\bfromName\x12\x19\n" +
+	"\breply_to\x18\b \x01(\tR\areplyTo\x12\x17\n" +
+	"\ause_tls\x18\t \x01(\bR\x06useTls\x12\x17\n" +
+	"\ause_ssl\x18\n" +
+	" \x01(\bR\x06useSsl\"b\n" +
 	"\x03Key\x12\x13\n" +
 	"\x0fKEY_UNSPECIFIED\x10\x00\x12\v\n" +
 	"\aGENERAL\x10\x01\x12\v\n" +
 	"\aSTORAGE\x10\x02\x12\x10\n" +
 	"\fMEMO_RELATED\x10\x03\x12\b\n" +
-	"\x04TAGS\x10\x04:a\xeaA^\n" +
+	"\x04TAGS\x10\x04\x12\x10\n" +
+	"\fNOTIFICATION\x10\x05:a\xeaA^\n" +
 	"\x1cmemos.api.v1/InstanceSetting\x12\x1binstance/settings/{setting}*\x10instanceSettings2\x0finstanceSettingB\a\n" +
 	"\x05value\"U\n" +
 	"\x19GetInstanceSettingRequest\x128\n" +
@@ -1077,7 +1276,7 @@ func file_api_v1_instance_service_proto_rawDescGZIP() []byte {
 }
 
 var file_api_v1_instance_service_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_api_v1_instance_service_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
+var file_api_v1_instance_service_proto_msgTypes = make([]protoimpl.MessageInfo, 15)
 var file_api_v1_instance_service_proto_goTypes = []any{
 	(InstanceSetting_Key)(0),                             // 0: memos.api.v1.InstanceSetting.Key
 	(InstanceSetting_StorageSetting_StorageType)(0),      // 1: memos.api.v1.InstanceSetting.StorageSetting.StorageType
@@ -1091,38 +1290,42 @@ var file_api_v1_instance_service_proto_goTypes = []any{
 	(*InstanceSetting_MemoRelatedSetting)(nil),           // 9: memos.api.v1.InstanceSetting.MemoRelatedSetting
 	(*InstanceSetting_TagMetadata)(nil),                  // 10: memos.api.v1.InstanceSetting.TagMetadata
 	(*InstanceSetting_TagsSetting)(nil),                  // 11: memos.api.v1.InstanceSetting.TagsSetting
-	(*InstanceSetting_GeneralSetting_CustomProfile)(nil), // 12: memos.api.v1.InstanceSetting.GeneralSetting.CustomProfile
-	(*InstanceSetting_StorageSetting_S3Config)(nil),      // 13: memos.api.v1.InstanceSetting.StorageSetting.S3Config
-	nil,                           // 14: memos.api.v1.InstanceSetting.TagsSetting.TagsEntry
-	(*User)(nil),                  // 15: memos.api.v1.User
-	(*fieldmaskpb.FieldMask)(nil), // 16: google.protobuf.FieldMask
-	(*color.Color)(nil),           // 17: google.type.Color
+	(*InstanceSetting_NotificationSetting)(nil),          // 12: memos.api.v1.InstanceSetting.NotificationSetting
+	(*InstanceSetting_GeneralSetting_CustomProfile)(nil), // 13: memos.api.v1.InstanceSetting.GeneralSetting.CustomProfile
+	(*InstanceSetting_StorageSetting_S3Config)(nil),      // 14: memos.api.v1.InstanceSetting.StorageSetting.S3Config
+	nil, // 15: memos.api.v1.InstanceSetting.TagsSetting.TagsEntry
+	(*InstanceSetting_NotificationSetting_EmailSetting)(nil), // 16: memos.api.v1.InstanceSetting.NotificationSetting.EmailSetting
+	(*User)(nil),                  // 17: memos.api.v1.User
+	(*fieldmaskpb.FieldMask)(nil), // 18: google.protobuf.FieldMask
+	(*color.Color)(nil),           // 19: google.type.Color
 }
 var file_api_v1_instance_service_proto_depIdxs = []int32{
-	15, // 0: memos.api.v1.InstanceProfile.admin:type_name -> memos.api.v1.User
+	17, // 0: memos.api.v1.InstanceProfile.admin:type_name -> memos.api.v1.User
 	7,  // 1: memos.api.v1.InstanceSetting.general_setting:type_name -> memos.api.v1.InstanceSetting.GeneralSetting
 	8,  // 2: memos.api.v1.InstanceSetting.storage_setting:type_name -> memos.api.v1.InstanceSetting.StorageSetting
 	9,  // 3: memos.api.v1.InstanceSetting.memo_related_setting:type_name -> memos.api.v1.InstanceSetting.MemoRelatedSetting
 	11, // 4: memos.api.v1.InstanceSetting.tags_setting:type_name -> memos.api.v1.InstanceSetting.TagsSetting
-	4,  // 5: memos.api.v1.UpdateInstanceSettingRequest.setting:type_name -> memos.api.v1.InstanceSetting
-	16, // 6: memos.api.v1.UpdateInstanceSettingRequest.update_mask:type_name -> google.protobuf.FieldMask
-	12, // 7: memos.api.v1.InstanceSetting.GeneralSetting.custom_profile:type_name -> memos.api.v1.InstanceSetting.GeneralSetting.CustomProfile
-	1,  // 8: memos.api.v1.InstanceSetting.StorageSetting.storage_type:type_name -> memos.api.v1.InstanceSetting.StorageSetting.StorageType
-	13, // 9: memos.api.v1.InstanceSetting.StorageSetting.s3_config:type_name -> memos.api.v1.InstanceSetting.StorageSetting.S3Config
-	17, // 10: memos.api.v1.InstanceSetting.TagMetadata.background_color:type_name -> google.type.Color
-	14, // 11: memos.api.v1.InstanceSetting.TagsSetting.tags:type_name -> memos.api.v1.InstanceSetting.TagsSetting.TagsEntry
-	10, // 12: memos.api.v1.InstanceSetting.TagsSetting.TagsEntry.value:type_name -> memos.api.v1.InstanceSetting.TagMetadata
-	3,  // 13: memos.api.v1.InstanceService.GetInstanceProfile:input_type -> memos.api.v1.GetInstanceProfileRequest
-	5,  // 14: memos.api.v1.InstanceService.GetInstanceSetting:input_type -> memos.api.v1.GetInstanceSettingRequest
-	6,  // 15: memos.api.v1.InstanceService.UpdateInstanceSetting:input_type -> memos.api.v1.UpdateInstanceSettingRequest
-	2,  // 16: memos.api.v1.InstanceService.GetInstanceProfile:output_type -> memos.api.v1.InstanceProfile
-	4,  // 17: memos.api.v1.InstanceService.GetInstanceSetting:output_type -> memos.api.v1.InstanceSetting
-	4,  // 18: memos.api.v1.InstanceService.UpdateInstanceSetting:output_type -> memos.api.v1.InstanceSetting
-	16, // [16:19] is the sub-list for method output_type
-	13, // [13:16] is the sub-list for method input_type
-	13, // [13:13] is the sub-list for extension type_name
-	13, // [13:13] is the sub-list for extension extendee
-	0,  // [0:13] is the sub-list for field type_name
+	12, // 5: memos.api.v1.InstanceSetting.notification_setting:type_name -> memos.api.v1.InstanceSetting.NotificationSetting
+	4,  // 6: memos.api.v1.UpdateInstanceSettingRequest.setting:type_name -> memos.api.v1.InstanceSetting
+	18, // 7: memos.api.v1.UpdateInstanceSettingRequest.update_mask:type_name -> google.protobuf.FieldMask
+	13, // 8: memos.api.v1.InstanceSetting.GeneralSetting.custom_profile:type_name -> memos.api.v1.InstanceSetting.GeneralSetting.CustomProfile
+	1,  // 9: memos.api.v1.InstanceSetting.StorageSetting.storage_type:type_name -> memos.api.v1.InstanceSetting.StorageSetting.StorageType
+	14, // 10: memos.api.v1.InstanceSetting.StorageSetting.s3_config:type_name -> memos.api.v1.InstanceSetting.StorageSetting.S3Config
+	19, // 11: memos.api.v1.InstanceSetting.TagMetadata.background_color:type_name -> google.type.Color
+	15, // 12: memos.api.v1.InstanceSetting.TagsSetting.tags:type_name -> memos.api.v1.InstanceSetting.TagsSetting.TagsEntry
+	16, // 13: memos.api.v1.InstanceSetting.NotificationSetting.email:type_name -> memos.api.v1.InstanceSetting.NotificationSetting.EmailSetting
+	10, // 14: memos.api.v1.InstanceSetting.TagsSetting.TagsEntry.value:type_name -> memos.api.v1.InstanceSetting.TagMetadata
+	3,  // 15: memos.api.v1.InstanceService.GetInstanceProfile:input_type -> memos.api.v1.GetInstanceProfileRequest
+	5,  // 16: memos.api.v1.InstanceService.GetInstanceSetting:input_type -> memos.api.v1.GetInstanceSettingRequest
+	6,  // 17: memos.api.v1.InstanceService.UpdateInstanceSetting:input_type -> memos.api.v1.UpdateInstanceSettingRequest
+	2,  // 18: memos.api.v1.InstanceService.GetInstanceProfile:output_type -> memos.api.v1.InstanceProfile
+	4,  // 19: memos.api.v1.InstanceService.GetInstanceSetting:output_type -> memos.api.v1.InstanceSetting
+	4,  // 20: memos.api.v1.InstanceService.UpdateInstanceSetting:output_type -> memos.api.v1.InstanceSetting
+	18, // [18:21] is the sub-list for method output_type
+	15, // [15:18] is the sub-list for method input_type
+	15, // [15:15] is the sub-list for extension type_name
+	15, // [15:15] is the sub-list for extension extendee
+	0,  // [0:15] is the sub-list for field type_name
 }
 
 func init() { file_api_v1_instance_service_proto_init() }
@@ -1136,6 +1339,7 @@ func file_api_v1_instance_service_proto_init() {
 		(*InstanceSetting_StorageSetting_)(nil),
 		(*InstanceSetting_MemoRelatedSetting_)(nil),
 		(*InstanceSetting_TagsSetting_)(nil),
+		(*InstanceSetting_NotificationSetting_)(nil),
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -1143,7 +1347,7 @@ func file_api_v1_instance_service_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_api_v1_instance_service_proto_rawDesc), len(file_api_v1_instance_service_proto_rawDesc)),
 			NumEnums:      2,
-			NumMessages:   13,
+			NumMessages:   15,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/proto/gen/openapi.yaml b/proto/gen/openapi.yaml
index 5dd207279..7983a4097 100644
--- a/proto/gen/openapi.yaml
+++ b/proto/gen/openapi.yaml
@@ -2192,6 +2192,8 @@ components:
                     $ref: '#/components/schemas/InstanceSetting_MemoRelatedSetting'
                 tagsSetting:
                     $ref: '#/components/schemas/InstanceSetting_TagsSetting'
+                notificationSetting:
+                    $ref: '#/components/schemas/InstanceSetting_NotificationSetting'
             description: An instance setting resource.
         InstanceSetting_GeneralSetting:
             type: object
@@ -2248,6 +2250,12 @@ components:
                         type: string
                     description: reactions is the list of reactions.
             description: Memo-related instance settings and policies.
+        InstanceSetting_NotificationSetting:
+            type: object
+            properties:
+                email:
+                    $ref: '#/components/schemas/NotificationSetting_EmailSetting'
+            description: Notification transport configuration.
         InstanceSetting_StorageSetting:
             type: object
             properties:
@@ -2626,6 +2634,31 @@ components:
                     type: string
                     description: The title extracted from the first H1 heading, if present.
             description: Computed properties of a memo.
+        NotificationSetting_EmailSetting:
+            type: object
+            properties:
+                enabled:
+                    type: boolean
+                smtpHost:
+                    type: string
+                smtpPort:
+                    type: integer
+                    format: int32
+                smtpUsername:
+                    type: string
+                smtpPassword:
+                    type: string
+                fromEmail:
+                    type: string
+                fromName:
+                    type: string
+                replyTo:
+                    type: string
+                useTls:
+                    type: boolean
+                useSsl:
+                    type: boolean
+            description: Email delivery configuration for notifications.
         OAuth2Config:
             type: object
             properties:
diff --git a/proto/gen/store/instance_setting.pb.go b/proto/gen/store/instance_setting.pb.go
index c3a9e325c..26bd5fcd4 100644
--- a/proto/gen/store/instance_setting.pb.go
+++ b/proto/gen/store/instance_setting.pb.go
@@ -36,6 +36,8 @@ const (
 	InstanceSettingKey_MEMO_RELATED InstanceSettingKey = 4
 	// TAGS is the key for tag metadata.
 	InstanceSettingKey_TAGS InstanceSettingKey = 5
+	// NOTIFICATION is the key for notification transport settings.
+	InstanceSettingKey_NOTIFICATION InstanceSettingKey = 6
 )
 
 // Enum value maps for InstanceSettingKey.
@@ -47,6 +49,7 @@ var (
 		3: "STORAGE",
 		4: "MEMO_RELATED",
 		5: "TAGS",
+		6: "NOTIFICATION",
 	}
 	InstanceSettingKey_value = map[string]int32{
 		"INSTANCE_SETTING_KEY_UNSPECIFIED": 0,
@@ -55,6 +58,7 @@ var (
 		"STORAGE":                          3,
 		"MEMO_RELATED":                     4,
 		"TAGS":                             5,
+		"NOTIFICATION":                     6,
 	}
 )
 
@@ -150,6 +154,7 @@ type InstanceSetting struct {
 	//	*InstanceSetting_StorageSetting
 	//	*InstanceSetting_MemoRelatedSetting
 	//	*InstanceSetting_TagsSetting
+	//	*InstanceSetting_NotificationSetting
 	Value         isInstanceSetting_Value `protobuf_oneof:"value"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
@@ -244,6 +249,15 @@ func (x *InstanceSetting) GetTagsSetting() *InstanceTagsSetting {
 	return nil
 }
 
+func (x *InstanceSetting) GetNotificationSetting() *InstanceNotificationSetting {
+	if x != nil {
+		if x, ok := x.Value.(*InstanceSetting_NotificationSetting); ok {
+			return x.NotificationSetting
+		}
+	}
+	return nil
+}
+
 type isInstanceSetting_Value interface {
 	isInstanceSetting_Value()
 }
@@ -268,6 +282,10 @@ type InstanceSetting_TagsSetting struct {
 	TagsSetting *InstanceTagsSetting `protobuf:"bytes,6,opt,name=tags_setting,json=tagsSetting,proto3,oneof"`
 }
 
+type InstanceSetting_NotificationSetting struct {
+	NotificationSetting *InstanceNotificationSetting `protobuf:"bytes,7,opt,name=notification_setting,json=notificationSetting,proto3,oneof"`
+}
+
 func (*InstanceSetting_BasicSetting) isInstanceSetting_Value() {}
 
 func (*InstanceSetting_GeneralSetting) isInstanceSetting_Value() {}
@@ -278,6 +296,8 @@ func (*InstanceSetting_MemoRelatedSetting) isInstanceSetting_Value() {}
 
 func (*InstanceSetting_TagsSetting) isInstanceSetting_Value() {}
 
+func (*InstanceSetting_NotificationSetting) isInstanceSetting_Value() {}
+
 type InstanceBasicSetting struct {
 	state protoimpl.MessageState `protogen:"open.v1"`
 	// The secret key for instance. Mainly used for session management.
@@ -830,18 +850,179 @@ func (x *InstanceTagsSetting) GetTags() map[string]*InstanceTagMetadata {
 	return nil
 }
 
+type InstanceNotificationSetting struct {
+	state         protoimpl.MessageState                    `protogen:"open.v1"`
+	Email         *InstanceNotificationSetting_EmailSetting `protobuf:"bytes,1,opt,name=email,proto3" json:"email,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *InstanceNotificationSetting) Reset() {
+	*x = InstanceNotificationSetting{}
+	mi := &file_store_instance_setting_proto_msgTypes[9]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *InstanceNotificationSetting) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InstanceNotificationSetting) ProtoMessage() {}
+
+func (x *InstanceNotificationSetting) ProtoReflect() protoreflect.Message {
+	mi := &file_store_instance_setting_proto_msgTypes[9]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InstanceNotificationSetting.ProtoReflect.Descriptor instead.
+func (*InstanceNotificationSetting) Descriptor() ([]byte, []int) {
+	return file_store_instance_setting_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *InstanceNotificationSetting) GetEmail() *InstanceNotificationSetting_EmailSetting {
+	if x != nil {
+		return x.Email
+	}
+	return nil
+}
+
+type InstanceNotificationSetting_EmailSetting struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Enabled       bool                   `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	SmtpHost      string                 `protobuf:"bytes,2,opt,name=smtp_host,json=smtpHost,proto3" json:"smtp_host,omitempty"`
+	SmtpPort      int32                  `protobuf:"varint,3,opt,name=smtp_port,json=smtpPort,proto3" json:"smtp_port,omitempty"`
+	SmtpUsername  string                 `protobuf:"bytes,4,opt,name=smtp_username,json=smtpUsername,proto3" json:"smtp_username,omitempty"`
+	SmtpPassword  string                 `protobuf:"bytes,5,opt,name=smtp_password,json=smtpPassword,proto3" json:"smtp_password,omitempty"`
+	FromEmail     string                 `protobuf:"bytes,6,opt,name=from_email,json=fromEmail,proto3" json:"from_email,omitempty"`
+	FromName      string                 `protobuf:"bytes,7,opt,name=from_name,json=fromName,proto3" json:"from_name,omitempty"`
+	ReplyTo       string                 `protobuf:"bytes,8,opt,name=reply_to,json=replyTo,proto3" json:"reply_to,omitempty"`
+	UseTls        bool                   `protobuf:"varint,9,opt,name=use_tls,json=useTls,proto3" json:"use_tls,omitempty"`
+	UseSsl        bool                   `protobuf:"varint,10,opt,name=use_ssl,json=useSsl,proto3" json:"use_ssl,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) Reset() {
+	*x = InstanceNotificationSetting_EmailSetting{}
+	mi := &file_store_instance_setting_proto_msgTypes[11]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InstanceNotificationSetting_EmailSetting) ProtoMessage() {}
+
+func (x *InstanceNotificationSetting_EmailSetting) ProtoReflect() protoreflect.Message {
+	mi := &file_store_instance_setting_proto_msgTypes[11]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InstanceNotificationSetting_EmailSetting.ProtoReflect.Descriptor instead.
+func (*InstanceNotificationSetting_EmailSetting) Descriptor() ([]byte, []int) {
+	return file_store_instance_setting_proto_rawDescGZIP(), []int{9, 0}
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetEnabled() bool {
+	if x != nil {
+		return x.Enabled
+	}
+	return false
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetSmtpHost() string {
+	if x != nil {
+		return x.SmtpHost
+	}
+	return ""
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetSmtpPort() int32 {
+	if x != nil {
+		return x.SmtpPort
+	}
+	return 0
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetSmtpUsername() string {
+	if x != nil {
+		return x.SmtpUsername
+	}
+	return ""
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetSmtpPassword() string {
+	if x != nil {
+		return x.SmtpPassword
+	}
+	return ""
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetFromEmail() string {
+	if x != nil {
+		return x.FromEmail
+	}
+	return ""
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetFromName() string {
+	if x != nil {
+		return x.FromName
+	}
+	return ""
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetReplyTo() string {
+	if x != nil {
+		return x.ReplyTo
+	}
+	return ""
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetUseTls() bool {
+	if x != nil {
+		return x.UseTls
+	}
+	return false
+}
+
+func (x *InstanceNotificationSetting_EmailSetting) GetUseSsl() bool {
+	if x != nil {
+		return x.UseSsl
+	}
+	return false
+}
+
 var File_store_instance_setting_proto protoreflect.FileDescriptor
 
 const file_store_instance_setting_proto_rawDesc = "" +
 	"\n" +
-	"\x1cstore/instance_setting.proto\x12\vmemos.store\x1a\x17google/type/color.proto\"\xdb\x03\n" +
+	"\x1cstore/instance_setting.proto\x12\vmemos.store\x1a\x17google/type/color.proto\"\xba\x04\n" +
 	"\x0fInstanceSetting\x121\n" +
 	"\x03key\x18\x01 \x01(\x0e2\x1f.memos.store.InstanceSettingKeyR\x03key\x12H\n" +
 	"\rbasic_setting\x18\x02 \x01(\v2!.memos.store.InstanceBasicSettingH\x00R\fbasicSetting\x12N\n" +
 	"\x0fgeneral_setting\x18\x03 \x01(\v2#.memos.store.InstanceGeneralSettingH\x00R\x0egeneralSetting\x12N\n" +
 	"\x0fstorage_setting\x18\x04 \x01(\v2#.memos.store.InstanceStorageSettingH\x00R\x0estorageSetting\x12[\n" +
 	"\x14memo_related_setting\x18\x05 \x01(\v2'.memos.store.InstanceMemoRelatedSettingH\x00R\x12memoRelatedSetting\x12E\n" +
-	"\ftags_setting\x18\x06 \x01(\v2 .memos.store.InstanceTagsSettingH\x00R\vtagsSettingB\a\n" +
+	"\ftags_setting\x18\x06 \x01(\v2 .memos.store.InstanceTagsSettingH\x00R\vtagsSetting\x12]\n" +
+	"\x14notification_setting\x18\a \x01(\v2(.memos.store.InstanceNotificationSettingH\x00R\x13notificationSettingB\a\n" +
 	"\x05value\"\\\n" +
 	"\x14InstanceBasicSetting\x12\x1d\n" +
 	"\n" +
@@ -889,14 +1070,30 @@ const file_store_instance_setting_proto_rawDesc = "" +
 	"\x04tags\x18\x01 \x03(\v2*.memos.store.InstanceTagsSetting.TagsEntryR\x04tags\x1aY\n" +
 	"\tTagsEntry\x12\x10\n" +
 	"\x03key\x18\x01 \x01(\tR\x03key\x126\n" +
-	"\x05value\x18\x02 \x01(\v2 .memos.store.InstanceTagMetadataR\x05value:\x028\x01*{\n" +
+	"\x05value\x18\x02 \x01(\v2 .memos.store.InstanceTagMetadataR\x05value:\x028\x01\"\xa2\x03\n" +
+	"\x1bInstanceNotificationSetting\x12K\n" +
+	"\x05email\x18\x01 \x01(\v25.memos.store.InstanceNotificationSetting.EmailSettingR\x05email\x1a\xb5\x02\n" +
+	"\fEmailSetting\x12\x18\n" +
+	"\aenabled\x18\x01 \x01(\bR\aenabled\x12\x1b\n" +
+	"\tsmtp_host\x18\x02 \x01(\tR\bsmtpHost\x12\x1b\n" +
+	"\tsmtp_port\x18\x03 \x01(\x05R\bsmtpPort\x12#\n" +
+	"\rsmtp_username\x18\x04 \x01(\tR\fsmtpUsername\x12#\n" +
+	"\rsmtp_password\x18\x05 \x01(\tR\fsmtpPassword\x12\x1d\n" +
+	"\n" +
+	"from_email\x18\x06 \x01(\tR\tfromEmail\x12\x1b\n" +
+	"\tfrom_name\x18\a \x01(\tR\bfromName\x12\x19\n" +
+	"\breply_to\x18\b \x01(\tR\areplyTo\x12\x17\n" +
+	"\ause_tls\x18\t \x01(\bR\x06useTls\x12\x17\n" +
+	"\ause_ssl\x18\n" +
+	" \x01(\bR\x06useSsl*\x8d\x01\n" +
 	"\x12InstanceSettingKey\x12$\n" +
 	" INSTANCE_SETTING_KEY_UNSPECIFIED\x10\x00\x12\t\n" +
 	"\x05BASIC\x10\x01\x12\v\n" +
 	"\aGENERAL\x10\x02\x12\v\n" +
 	"\aSTORAGE\x10\x03\x12\x10\n" +
 	"\fMEMO_RELATED\x10\x04\x12\b\n" +
-	"\x04TAGS\x10\x05B\x9f\x01\n" +
+	"\x04TAGS\x10\x05\x12\x10\n" +
+	"\fNOTIFICATION\x10\x06B\x9f\x01\n" +
 	"\x0fcom.memos.storeB\x14InstanceSettingProtoP\x01Z)github.com/usememos/memos/proto/gen/store\xa2\x02\x03MSX\xaa\x02\vMemos.Store\xca\x02\vMemos\\Store\xe2\x02\x17Memos\\Store\\GPBMetadata\xea\x02\fMemos::Storeb\x06proto3"
 
 var (
@@ -912,21 +1109,23 @@ func file_store_instance_setting_proto_rawDescGZIP() []byte {
 }
 
 var file_store_instance_setting_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_store_instance_setting_proto_msgTypes = make([]protoimpl.MessageInfo, 10)
+var file_store_instance_setting_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
 var file_store_instance_setting_proto_goTypes = []any{
-	(InstanceSettingKey)(0),                 // 0: memos.store.InstanceSettingKey
-	(InstanceStorageSetting_StorageType)(0), // 1: memos.store.InstanceStorageSetting.StorageType
-	(*InstanceSetting)(nil),                 // 2: memos.store.InstanceSetting
-	(*InstanceBasicSetting)(nil),            // 3: memos.store.InstanceBasicSetting
-	(*InstanceGeneralSetting)(nil),          // 4: memos.store.InstanceGeneralSetting
-	(*InstanceCustomProfile)(nil),           // 5: memos.store.InstanceCustomProfile
-	(*InstanceStorageSetting)(nil),          // 6: memos.store.InstanceStorageSetting
-	(*StorageS3Config)(nil),                 // 7: memos.store.StorageS3Config
-	(*InstanceMemoRelatedSetting)(nil),      // 8: memos.store.InstanceMemoRelatedSetting
-	(*InstanceTagMetadata)(nil),             // 9: memos.store.InstanceTagMetadata
-	(*InstanceTagsSetting)(nil),             // 10: memos.store.InstanceTagsSetting
-	nil,                                     // 11: memos.store.InstanceTagsSetting.TagsEntry
-	(*color.Color)(nil),                     // 12: google.type.Color
+	(InstanceSettingKey)(0),                          // 0: memos.store.InstanceSettingKey
+	(InstanceStorageSetting_StorageType)(0),          // 1: memos.store.InstanceStorageSetting.StorageType
+	(*InstanceSetting)(nil),                          // 2: memos.store.InstanceSetting
+	(*InstanceBasicSetting)(nil),                     // 3: memos.store.InstanceBasicSetting
+	(*InstanceGeneralSetting)(nil),                   // 4: memos.store.InstanceGeneralSetting
+	(*InstanceCustomProfile)(nil),                    // 5: memos.store.InstanceCustomProfile
+	(*InstanceStorageSetting)(nil),                   // 6: memos.store.InstanceStorageSetting
+	(*StorageS3Config)(nil),                          // 7: memos.store.StorageS3Config
+	(*InstanceMemoRelatedSetting)(nil),               // 8: memos.store.InstanceMemoRelatedSetting
+	(*InstanceTagMetadata)(nil),                      // 9: memos.store.InstanceTagMetadata
+	(*InstanceTagsSetting)(nil),                      // 10: memos.store.InstanceTagsSetting
+	(*InstanceNotificationSetting)(nil),              // 11: memos.store.InstanceNotificationSetting
+	nil,                                              // 12: memos.store.InstanceTagsSetting.TagsEntry
+	(*InstanceNotificationSetting_EmailSetting)(nil), // 13: memos.store.InstanceNotificationSetting.EmailSetting
+	(*color.Color)(nil),                              // 14: google.type.Color
 }
 var file_store_instance_setting_proto_depIdxs = []int32{
 	0,  // 0: memos.store.InstanceSetting.key:type_name -> memos.store.InstanceSettingKey
@@ -935,17 +1134,19 @@ var file_store_instance_setting_proto_depIdxs = []int32{
 	6,  // 3: memos.store.InstanceSetting.storage_setting:type_name -> memos.store.InstanceStorageSetting
 	8,  // 4: memos.store.InstanceSetting.memo_related_setting:type_name -> memos.store.InstanceMemoRelatedSetting
 	10, // 5: memos.store.InstanceSetting.tags_setting:type_name -> memos.store.InstanceTagsSetting
-	5,  // 6: memos.store.InstanceGeneralSetting.custom_profile:type_name -> memos.store.InstanceCustomProfile
-	1,  // 7: memos.store.InstanceStorageSetting.storage_type:type_name -> memos.store.InstanceStorageSetting.StorageType
-	7,  // 8: memos.store.InstanceStorageSetting.s3_config:type_name -> memos.store.StorageS3Config
-	12, // 9: memos.store.InstanceTagMetadata.background_color:type_name -> google.type.Color
-	11, // 10: memos.store.InstanceTagsSetting.tags:type_name -> memos.store.InstanceTagsSetting.TagsEntry
-	9,  // 11: memos.store.InstanceTagsSetting.TagsEntry.value:type_name -> memos.store.InstanceTagMetadata
-	12, // [12:12] is the sub-list for method output_type
-	12, // [12:12] is the sub-list for method input_type
-	12, // [12:12] is the sub-list for extension type_name
-	12, // [12:12] is the sub-list for extension extendee
-	0,  // [0:12] is the sub-list for field type_name
+	11, // 6: memos.store.InstanceSetting.notification_setting:type_name -> memos.store.InstanceNotificationSetting
+	5,  // 7: memos.store.InstanceGeneralSetting.custom_profile:type_name -> memos.store.InstanceCustomProfile
+	1,  // 8: memos.store.InstanceStorageSetting.storage_type:type_name -> memos.store.InstanceStorageSetting.StorageType
+	7,  // 9: memos.store.InstanceStorageSetting.s3_config:type_name -> memos.store.StorageS3Config
+	14, // 10: memos.store.InstanceTagMetadata.background_color:type_name -> google.type.Color
+	12, // 11: memos.store.InstanceTagsSetting.tags:type_name -> memos.store.InstanceTagsSetting.TagsEntry
+	13, // 12: memos.store.InstanceNotificationSetting.email:type_name -> memos.store.InstanceNotificationSetting.EmailSetting
+	9,  // 13: memos.store.InstanceTagsSetting.TagsEntry.value:type_name -> memos.store.InstanceTagMetadata
+	14, // [14:14] is the sub-list for method output_type
+	14, // [14:14] is the sub-list for method input_type
+	14, // [14:14] is the sub-list for extension type_name
+	14, // [14:14] is the sub-list for extension extendee
+	0,  // [0:14] is the sub-list for field type_name
 }
 
 func init() { file_store_instance_setting_proto_init() }
@@ -959,6 +1160,7 @@ func file_store_instance_setting_proto_init() {
 		(*InstanceSetting_StorageSetting)(nil),
 		(*InstanceSetting_MemoRelatedSetting)(nil),
 		(*InstanceSetting_TagsSetting)(nil),
+		(*InstanceSetting_NotificationSetting)(nil),
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -966,7 +1168,7 @@ func file_store_instance_setting_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_store_instance_setting_proto_rawDesc), len(file_store_instance_setting_proto_rawDesc)),
 			NumEnums:      2,
-			NumMessages:   10,
+			NumMessages:   12,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/proto/store/instance_setting.proto b/proto/store/instance_setting.proto
index 62bb3db44..b0ab9a4b2 100644
--- a/proto/store/instance_setting.proto
+++ b/proto/store/instance_setting.proto
@@ -18,6 +18,8 @@ enum InstanceSettingKey {
   MEMO_RELATED = 4;
   // TAGS is the key for tag metadata.
   TAGS = 5;
+  // NOTIFICATION is the key for notification transport settings.
+  NOTIFICATION = 6;
 }
 
 message InstanceSetting {
@@ -28,6 +30,7 @@ message InstanceSetting {
     InstanceStorageSetting storage_setting = 4;
     InstanceMemoRelatedSetting memo_related_setting = 5;
     InstanceTagsSetting tags_setting = 6;
+    InstanceNotificationSetting notification_setting = 7;
   }
 }
 
@@ -117,3 +120,20 @@ message InstanceTagMetadata {
 message InstanceTagsSetting {
   map<string, InstanceTagMetadata> tags = 1;
 }
+
+message InstanceNotificationSetting {
+  EmailSetting email = 1;
+
+  message EmailSetting {
+    bool enabled = 1;
+    string smtp_host = 2;
+    int32 smtp_port = 3;
+    string smtp_username = 4;
+    string smtp_password = 5;
+    string from_email = 6;
+    string from_name = 7;
+    string reply_to = 8;
+    bool use_tls = 9;
+    bool use_ssl = 10;
+  }
+}
diff --git a/server/router/api/v1/instance_service.go b/server/router/api/v1/instance_service.go
index dcee7f301..042df9d34 100644
--- a/server/router/api/v1/instance_service.go
+++ b/server/router/api/v1/instance_service.go
@@ -51,6 +51,8 @@ func (s *APIV1Service) GetInstanceSetting(ctx context.Context, request *v1pb.Get
 		_, err = s.Store.GetInstanceStorageSetting(ctx)
 	case storepb.InstanceSettingKey_TAGS:
 		_, err = s.Store.GetInstanceTagsSetting(ctx)
+	case storepb.InstanceSettingKey_NOTIFICATION:
+		_, err = s.Store.GetInstanceNotificationSetting(ctx)
 	default:
 		return nil, status.Errorf(codes.InvalidArgument, "unsupported instance setting key: %v", instanceSettingKey)
 	}
@@ -134,6 +136,10 @@ func convertInstanceSettingFromStore(setting *storepb.InstanceSetting) *v1pb.Ins
 		instanceSetting.Value = &v1pb.InstanceSetting_TagsSetting_{
 			TagsSetting: convertInstanceTagsSettingFromStore(setting.GetTagsSetting()),
 		}
+	case *storepb.InstanceSetting_NotificationSetting:
+		instanceSetting.Value = &v1pb.InstanceSetting_NotificationSetting_{
+			NotificationSetting: convertInstanceNotificationSettingFromStore(setting.GetNotificationSetting()),
+		}
 	default:
 		// Leave Value unset for unsupported setting variants.
 	}
@@ -165,6 +171,10 @@ func convertInstanceSettingToStore(setting *v1pb.InstanceSetting) *storepb.Insta
 		instanceSetting.Value = &storepb.InstanceSetting_TagsSetting{
 			TagsSetting: convertInstanceTagsSettingToStore(setting.GetTagsSetting()),
 		}
+	case storepb.InstanceSettingKey_NOTIFICATION:
+		instanceSetting.Value = &storepb.InstanceSetting_NotificationSetting{
+			NotificationSetting: convertInstanceNotificationSettingToStore(setting.GetNotificationSetting()),
+		}
 	default:
 		// Keep the default GeneralSetting value
 	}
@@ -318,6 +328,52 @@ func convertInstanceTagsSettingToStore(setting *v1pb.InstanceSetting_TagsSetting
 	}
 }
 
+func convertInstanceNotificationSettingFromStore(setting *storepb.InstanceNotificationSetting) *v1pb.InstanceSetting_NotificationSetting {
+	if setting == nil {
+		return nil
+	}
+
+	notificationSetting := &v1pb.InstanceSetting_NotificationSetting{}
+	if setting.Email != nil {
+		notificationSetting.Email = &v1pb.InstanceSetting_NotificationSetting_EmailSetting{
+			Enabled:      setting.Email.Enabled,
+			SmtpHost:     setting.Email.SmtpHost,
+			SmtpPort:     setting.Email.SmtpPort,
+			SmtpUsername: setting.Email.SmtpUsername,
+			SmtpPassword: setting.Email.SmtpPassword,
+			FromEmail:    setting.Email.FromEmail,
+			FromName:     setting.Email.FromName,
+			ReplyTo:      setting.Email.ReplyTo,
+			UseTls:       setting.Email.UseTls,
+			UseSsl:       setting.Email.UseSsl,
+		}
+	}
+	return notificationSetting
+}
+
+func convertInstanceNotificationSettingToStore(setting *v1pb.InstanceSetting_NotificationSetting) *storepb.InstanceNotificationSetting {
+	if setting == nil {
+		return nil
+	}
+
+	notificationSetting := &storepb.InstanceNotificationSetting{}
+	if setting.Email != nil {
+		notificationSetting.Email = &storepb.InstanceNotificationSetting_EmailSetting{
+			Enabled:      setting.Email.Enabled,
+			SmtpHost:     setting.Email.SmtpHost,
+			SmtpPort:     setting.Email.SmtpPort,
+			SmtpUsername: setting.Email.SmtpUsername,
+			SmtpPassword: setting.Email.SmtpPassword,
+			FromEmail:    setting.Email.FromEmail,
+			FromName:     setting.Email.FromName,
+			ReplyTo:      setting.Email.ReplyTo,
+			UseTls:       setting.Email.UseTls,
+			UseSsl:       setting.Email.UseSsl,
+		}
+	}
+	return notificationSetting
+}
+
 func validateInstanceSetting(setting *v1pb.InstanceSetting) error {
 	key, err := ExtractInstanceSettingKeyFromName(setting.Name)
 	if err != nil {
diff --git a/server/router/api/v1/test/instance_service_test.go b/server/router/api/v1/test/instance_service_test.go
index 2fb9ff6e4..609989dab 100644
--- a/server/router/api/v1/test/instance_service_test.go
+++ b/server/router/api/v1/test/instance_service_test.go
@@ -204,6 +204,23 @@ func TestGetInstanceSetting(t *testing.T) {
 		require.Empty(t, resp.GetTagsSetting().GetTags())
 	})
 
+	t.Run("GetInstanceSetting - notification setting", func(t *testing.T) {
+		ts := NewTestService(t)
+		defer ts.Cleanup()
+
+		req := &v1pb.GetInstanceSettingRequest{
+			Name: "instance/settings/NOTIFICATION",
+		}
+		resp, err := ts.Service.GetInstanceSetting(ctx, req)
+
+		require.NoError(t, err)
+		require.NotNil(t, resp)
+		require.Equal(t, "instance/settings/NOTIFICATION", resp.Name)
+		require.NotNil(t, resp.GetNotificationSetting())
+		require.NotNil(t, resp.GetNotificationSetting().GetEmail())
+		require.False(t, resp.GetNotificationSetting().GetEmail().GetEnabled())
+	})
+
 	t.Run("GetInstanceSetting - invalid setting name", func(t *testing.T) {
 		// Create test service for this specific test
 		ts := NewTestService(t)
@@ -283,4 +300,39 @@ func TestUpdateInstanceSetting(t *testing.T) {
 		require.Error(t, err)
 		require.Contains(t, err.Error(), "invalid instance setting")
 	})
+
+	t.Run("UpdateInstanceSetting - notification setting", func(t *testing.T) {
+		ts := NewTestService(t)
+		defer ts.Cleanup()
+
+		hostUser, err := ts.CreateHostUser(ctx, "admin")
+		require.NoError(t, err)
+
+		resp, err := ts.Service.UpdateInstanceSetting(ts.CreateUserContext(ctx, hostUser.ID), &v1pb.UpdateInstanceSettingRequest{
+			Setting: &v1pb.InstanceSetting{
+				Name: "instance/settings/NOTIFICATION",
+				Value: &v1pb.InstanceSetting_NotificationSetting_{
+					NotificationSetting: &v1pb.InstanceSetting_NotificationSetting{
+						Email: &v1pb.InstanceSetting_NotificationSetting_EmailSetting{
+							Enabled:      true,
+							SmtpHost:     "smtp.example.com",
+							SmtpPort:     587,
+							SmtpUsername: "bot@example.com",
+							SmtpPassword: "secret",
+							FromEmail:    "bot@example.com",
+							FromName:     "Memos Bot",
+							ReplyTo:      "support@example.com",
+							UseTls:       true,
+						},
+					},
+				},
+			},
+			UpdateMask: &fieldmaskpb.FieldMask{Paths: []string{"notification_setting"}},
+		})
+		require.NoError(t, err)
+		require.NotNil(t, resp.GetNotificationSetting())
+		require.NotNil(t, resp.GetNotificationSetting().GetEmail())
+		require.True(t, resp.GetNotificationSetting().GetEmail().GetEnabled())
+		require.Equal(t, "smtp.example.com", resp.GetNotificationSetting().GetEmail().GetSmtpHost())
+	})
 }
diff --git a/store/instance_setting.go b/store/instance_setting.go
index 2acc91fa1..4f24ebeec 100644
--- a/store/instance_setting.go
+++ b/store/instance_setting.go
@@ -39,6 +39,8 @@ func (s *Store) UpsertInstanceSetting(ctx context.Context, upsert *storepb.Insta
 		valueBytes, err = protojson.Marshal(upsert.GetMemoRelatedSetting())
 	} else if upsert.Key == storepb.InstanceSettingKey_TAGS {
 		valueBytes, err = protojson.Marshal(upsert.GetTagsSetting())
+	} else if upsert.Key == storepb.InstanceSettingKey_NOTIFICATION {
+		valueBytes, err = protojson.Marshal(upsert.GetNotificationSetting())
 	} else {
 		return nil, errors.Errorf("unsupported instance setting key: %v", upsert.Key)
 	}
@@ -192,6 +194,28 @@ func (s *Store) GetInstanceTagsSetting(ctx context.Context) (*storepb.InstanceTa
 	return instanceTagsSetting, nil
 }
 
+func (s *Store) GetInstanceNotificationSetting(ctx context.Context) (*storepb.InstanceNotificationSetting, error) {
+	instanceSetting, err := s.GetInstanceSetting(ctx, &FindInstanceSetting{
+		Name: storepb.InstanceSettingKey_NOTIFICATION.String(),
+	})
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get instance notification setting")
+	}
+
+	instanceNotificationSetting := &storepb.InstanceNotificationSetting{}
+	if instanceSetting != nil {
+		instanceNotificationSetting = instanceSetting.GetNotificationSetting()
+	}
+	if instanceNotificationSetting.Email == nil {
+		instanceNotificationSetting.Email = &storepb.InstanceNotificationSetting_EmailSetting{}
+	}
+	s.instanceSettingCache.Set(ctx, storepb.InstanceSettingKey_NOTIFICATION.String(), &storepb.InstanceSetting{
+		Key:   storepb.InstanceSettingKey_NOTIFICATION,
+		Value: &storepb.InstanceSetting_NotificationSetting{NotificationSetting: instanceNotificationSetting},
+	})
+	return instanceNotificationSetting, nil
+}
+
 const (
 	defaultInstanceStorageType       = storepb.InstanceStorageSetting_LOCAL
 	defaultInstanceUploadSizeLimitMb = 30
@@ -261,6 +285,12 @@ func convertInstanceSettingFromRaw(instanceSettingRaw *InstanceSetting) (*storep
 			return nil, err
 		}
 		instanceSetting.Value = &storepb.InstanceSetting_TagsSetting{TagsSetting: tagsSetting}
+	case storepb.InstanceSettingKey_NOTIFICATION.String():
+		notificationSetting := &storepb.InstanceNotificationSetting{}
+		if err := protojsonUnmarshaler.Unmarshal([]byte(instanceSettingRaw.Value), notificationSetting); err != nil {
+			return nil, err
+		}
+		instanceSetting.Value = &storepb.InstanceSetting_NotificationSetting{NotificationSetting: notificationSetting}
 	default:
 		// Skip unsupported instance setting key.
 		return nil, nil
diff --git a/store/test/instance_setting_test.go b/store/test/instance_setting_test.go
index 7c4c97758..618396da1 100644
--- a/store/test/instance_setting_test.go
+++ b/store/test/instance_setting_test.go
@@ -257,6 +257,47 @@ func TestInstanceSettingTagsSetting(t *testing.T) {
 	ts.Close()
 }
 
+func TestInstanceSettingNotificationSetting(t *testing.T) {
+	t.Parallel()
+	ctx := context.Background()
+	ts := NewTestingStore(ctx, t)
+
+	notificationSetting, err := ts.GetInstanceNotificationSetting(ctx)
+	require.NoError(t, err)
+	require.NotNil(t, notificationSetting)
+	require.NotNil(t, notificationSetting.Email)
+	require.False(t, notificationSetting.Email.Enabled)
+
+	_, err = ts.UpsertInstanceSetting(ctx, &storepb.InstanceSetting{
+		Key: storepb.InstanceSettingKey_NOTIFICATION,
+		Value: &storepb.InstanceSetting_NotificationSetting{
+			NotificationSetting: &storepb.InstanceNotificationSetting{
+				Email: &storepb.InstanceNotificationSetting_EmailSetting{
+					Enabled:      true,
+					SmtpHost:     "smtp.example.com",
+					SmtpPort:     587,
+					SmtpUsername: "bot@example.com",
+					SmtpPassword: "secret",
+					FromEmail:    "bot@example.com",
+					FromName:     "Memos Bot",
+					ReplyTo:      "support@example.com",
+					UseTls:       true,
+				},
+			},
+		},
+	})
+	require.NoError(t, err)
+
+	notificationSetting, err = ts.GetInstanceNotificationSetting(ctx)
+	require.NoError(t, err)
+	require.True(t, notificationSetting.Email.Enabled)
+	require.Equal(t, "smtp.example.com", notificationSetting.Email.SmtpHost)
+	require.Equal(t, int32(587), notificationSetting.Email.SmtpPort)
+	require.Equal(t, "bot@example.com", notificationSetting.Email.FromEmail)
+
+	ts.Close()
+}
+
 func TestInstanceSettingListAll(t *testing.T) {
 	t.Parallel()
 	ctx := context.Background()
@@ -284,10 +325,18 @@ func TestInstanceSettingListAll(t *testing.T) {
 	})
 	require.NoError(t, err)
 
-	// List all - should have 2 more than initial
+	_, err = ts.UpsertInstanceSetting(ctx, &storepb.InstanceSetting{
+		Key: storepb.InstanceSettingKey_NOTIFICATION,
+		Value: &storepb.InstanceSetting_NotificationSetting{
+			NotificationSetting: &storepb.InstanceNotificationSetting{},
+		},
+	})
+	require.NoError(t, err)
+
+	// List all - should have 3 more than initial
 	list, err := ts.ListInstanceSettings(ctx, &store.FindInstanceSetting{})
 	require.NoError(t, err)
-	require.Equal(t, initialCount+2, len(list))
+	require.Equal(t, initialCount+3, len(list))
 
 	ts.Close()
 }
diff --git a/web/src/types/proto/api/v1/instance_service_pb.ts b/web/src/types/proto/api/v1/instance_service_pb.ts
index b3311189f..49ddea554 100644
--- a/web/src/types/proto/api/v1/instance_service_pb.ts
+++ b/web/src/types/proto/api/v1/instance_service_pb.ts
@@ -10,17 +10,17 @@ import { file_google_api_annotations } from "../../google/api/annotations_pb";
 import { file_google_api_client } from "../../google/api/client_pb";
 import { file_google_api_field_behavior } from "../../google/api/field_behavior_pb";
 import { file_google_api_resource } from "../../google/api/resource_pb";
-import type { Color } from "../../google/type/color_pb";
-import { file_google_type_color } from "../../google/type/color_pb";
 import type { FieldMask } from "@bufbuild/protobuf/wkt";
 import { file_google_protobuf_field_mask } from "@bufbuild/protobuf/wkt";
+import type { Color } from "../../google/type/color_pb";
+import { file_google_type_color } from "../../google/type/color_pb";
 import type { Message } from "@bufbuild/protobuf";
 
 /**
  * Describes the file api/v1/instance_service.proto.
  */
 export const file_api_v1_instance_service: GenFile = /*@__PURE__*/
-  fileDesc("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", [file_api_v1_user_service, file_google_api_annotations, file_google_api_client, file_google_api_field_behavior, file_google_api_resource, file_google_type_color, file_google_protobuf_field_mask]);
+  fileDesc("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", [file_api_v1_user_service, file_google_api_annotations, file_google_api_client, file_google_api_field_behavior, file_google_api_resource, file_google_protobuf_field_mask, file_google_type_color]);
 
 /**
  * Instance profile message containing basic instance information.
@@ -121,6 +121,12 @@ export type InstanceSetting = Message<"memos.api.v1.InstanceSetting"> & {
      */
     value: InstanceSetting_TagsSetting;
     case: "tagsSetting";
+  } | {
+    /**
+     * @generated from field: memos.api.v1.InstanceSetting.NotificationSetting notification_setting = 6;
+     */
+    value: InstanceSetting_NotificationSetting;
+    case: "notificationSetting";
   } | { case: undefined; value?: undefined };
 };
 
@@ -448,6 +454,89 @@ export type InstanceSetting_TagsSetting = Message<"memos.api.v1.InstanceSetting.
 export const InstanceSetting_TagsSettingSchema: GenMessage<InstanceSetting_TagsSetting> = /*@__PURE__*/
   messageDesc(file_api_v1_instance_service, 2, 4);
 
+/**
+ * Notification transport configuration.
+ *
+ * @generated from message memos.api.v1.InstanceSetting.NotificationSetting
+ */
+export type InstanceSetting_NotificationSetting = Message<"memos.api.v1.InstanceSetting.NotificationSetting"> & {
+  /**
+   * @generated from field: memos.api.v1.InstanceSetting.NotificationSetting.EmailSetting email = 1;
+   */
+  email?: InstanceSetting_NotificationSetting_EmailSetting;
+};
+
+/**
+ * Describes the message memos.api.v1.InstanceSetting.NotificationSetting.
+ * Use `create(InstanceSetting_NotificationSettingSchema)` to create a new message.
+ */
+export const InstanceSetting_NotificationSettingSchema: GenMessage<InstanceSetting_NotificationSetting> = /*@__PURE__*/
+  messageDesc(file_api_v1_instance_service, 2, 5);
+
+/**
+ * Email delivery configuration for notifications.
+ *
+ * @generated from message memos.api.v1.InstanceSetting.NotificationSetting.EmailSetting
+ */
+export type InstanceSetting_NotificationSetting_EmailSetting = Message<"memos.api.v1.InstanceSetting.NotificationSetting.EmailSetting"> & {
+  /**
+   * @generated from field: bool enabled = 1;
+   */
+  enabled: boolean;
+
+  /**
+   * @generated from field: string smtp_host = 2;
+   */
+  smtpHost: string;
+
+  /**
+   * @generated from field: int32 smtp_port = 3;
+   */
+  smtpPort: number;
+
+  /**
+   * @generated from field: string smtp_username = 4;
+   */
+  smtpUsername: string;
+
+  /**
+   * @generated from field: string smtp_password = 5;
+   */
+  smtpPassword: string;
+
+  /**
+   * @generated from field: string from_email = 6;
+   */
+  fromEmail: string;
+
+  /**
+   * @generated from field: string from_name = 7;
+   */
+  fromName: string;
+
+  /**
+   * @generated from field: string reply_to = 8;
+   */
+  replyTo: string;
+
+  /**
+   * @generated from field: bool use_tls = 9;
+   */
+  useTls: boolean;
+
+  /**
+   * @generated from field: bool use_ssl = 10;
+   */
+  useSsl: boolean;
+};
+
+/**
+ * Describes the message memos.api.v1.InstanceSetting.NotificationSetting.EmailSetting.
+ * Use `create(InstanceSetting_NotificationSetting_EmailSettingSchema)` to create a new message.
+ */
+export const InstanceSetting_NotificationSetting_EmailSettingSchema: GenMessage<InstanceSetting_NotificationSetting_EmailSetting> = /*@__PURE__*/
+  messageDesc(file_api_v1_instance_service, 2, 5, 0);
+
 /**
  * Enumeration of instance setting keys.
  *
@@ -486,6 +575,13 @@ export enum InstanceSetting_Key {
    * @generated from enum value: TAGS = 4;
    */
   TAGS = 4,
+
+  /**
+   * NOTIFICATION is the key for notification transport settings.
+   *
+   * @generated from enum value: NOTIFICATION = 5;
+   */
+  NOTIFICATION = 5,
 }
 
 /**