feat: add option to disable TLS for email sending

backend/internal/dto/app_config_dto.go

@@ -22,5 +22,6 @@ type AppConfigUpdateDto struct {
 	SmtpFrom            string `json:"smtpFrom" binding:"omitempty,email"`
 	SmtpUser            string `json:"smtpUser"`
 	SmtpPassword        string `json:"smtpPassword"`
+	SmtpTls             string `json:"smtpTls"`
 	SmtpSkipCertVerify  string `json:"smtpSkipCertVerify"`
 }

backend/internal/model/app_config.go

@@ -25,5 +25,6 @@ type AppConfig struct {
 	SmtpFrom           AppConfigVariable
 	SmtpUser           AppConfigVariable
 	SmtpPassword       AppConfigVariable
+	SmtpTls            AppConfigVariable
 	SmtpSkipCertVerify AppConfigVariable
 }

backend/internal/service/app_config_service.go

@@ -95,6 +95,11 @@ var defaultDbConfig = model.AppConfig{
 		Key:  "smtpPassword",
 		Type: "string",
 	},
+	SmtpTls: model.AppConfigVariable{
+		Key:          "smtpTls",
+		Type:         "bool",
+		DefaultValue: "true",
+	},
 	SmtpSkipCertVerify: model.AppConfigVariable{
 		Key:          "smtpSkipCertVerify",
 		Type:         "bool",

backend/internal/service/email_service.go

@@ -98,15 +98,18 @@ func SendEmail[V any](srv *EmailService, toEmail email.Address, template email.T
 
 	// Connect to the SMTP server
 	port := srv.appConfigService.DbConfig.SmtpPort.Value
+	smtpAddress := srv.appConfigService.DbConfig.SmtpHost.Value + ":" + port
 	var client *smtp.Client
-	if port == "465" {
+	if srv.appConfigService.DbConfig.SmtpTls.Value == "false" {
+		client, err = smtp.Dial(smtpAddress)
+	} else if port == "465" {
 		client, err = srv.connectToSmtpServerUsingImplicitTLS(
-			srv.appConfigService.DbConfig.SmtpHost.Value+":"+port,
+			smtpAddress,
 			tlsConfig,
 		)
 	} else {
 		client, err = srv.connectToSmtpServerUsingStartTLS(
-			srv.appConfigService.DbConfig.SmtpHost.Value+":"+port,
+			smtpAddress,
 			tlsConfig,
 		)
 	}