diff --git a/pkg/services/notifications/mailer.go b/pkg/services/notifications/mailer.go
index 97bf75fdcb9..1ca4df8877a 100644
--- a/pkg/services/notifications/mailer.go
+++ b/pkg/services/notifications/mailer.go
@@ -101,6 +101,7 @@ func createDialer() (*gomail.Dialer, error) {
 
 	d := gomail.NewDialer(host, iPort, setting.Smtp.User, setting.Smtp.Password)
 	d.TLSConfig = tlsconfig
+	d.LocalName = setting.InstanceName
 	return d, nil
 }