[#3097] added SmtpConfig.LocalName option

models/settings/settings.go

@@ -371,6 +371,12 @@ type SmtpConfig struct {
 	// When set to false StartTLS command is send, leaving the server
 	// to decide whether to upgrade the connection or not.
 	Tls bool `form:"tls" json:"tls"`
+
+	// LocalName is optional domain name or IP address used for the
+	// EHLO/HELO exchange (if not explicitly set, defaults to "localhost").
+	//
+	// This is required only by some SMTP servers, such as Gmail SMTP-relay.
+	LocalName string `form:"localName" json:"localName"`
 }
 
 // Validate makes SmtpConfig validatable by implementing [validation.Validatable] interface.
@@ -393,6 +399,7 @@ func (c SmtpConfig) Validate() error {
 			// validation.When(c.Enabled, validation.Required),
 			validation.In(mailer.SmtpAuthLogin, mailer.SmtpAuthPlain),
 		),
+		validation.Field(&c.LocalName, is.Host),
 	)
 }
 

models/settings/settings_test.go

@@ -477,6 +477,26 @@ func TestSmtpConfigValidate(t *testing.T) {
 			},
 			false,
 		},
+		// invalid ehlo/helo name
+		{
+			settings.SmtpConfig{
+				Enabled:   true,
+				Host:      "example.com",
+				Port:      100,
+				LocalName: "invalid!",
+			},
+			true,
+		},
+		// valid ehlo/helo name
+		{
+			settings.SmtpConfig{
+				Enabled:   true,
+				Host:      "example.com",
+				Port:      100,
+				LocalName: "example.com",
+			},
+			false,
+		},
 	}
 
 	for i, scenario := range scenarios {