Don't log error when SendEmailNotifications is set to false (#20007)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/server.go

@@ -1196,8 +1196,11 @@ func (s *Server) Start() error {
 	if err := s.Store.Status().ResetAll(); err != nil {
 		mlog.Error("Error to reset the server status.", mlog.Err(err))
 	}
-	if err := mail.TestConnection(s.MailServiceConfig()); err != nil {
-		mlog.Error("Mail server connection test is failed", mlog.Err(err))
+
+	if s.MailServiceConfig().SendEmailNotifications {
+		if err := mail.TestConnection(s.MailServiceConfig()); err != nil {
+			mlog.Error("Mail server connection test failed", mlog.Err(err))
+		}
 	}
 
 	err := s.FileBackend().TestConnection()

shared/mail/mail.go

@@ -208,10 +208,6 @@ func NewSMTPClient(ctx context.Context, conn net.Conn, config *SMTPConfig) (*smt
 }
 
 func TestConnection(config *SMTPConfig) error {
-	if !config.SendEmailNotifications {
-		return errors.New("SendEmailNotifications is not true")
-	}
-
 	conn, err := ConnectToSMTPServer(config)
 	if err != nil {
 		return errors.Wrap(err, "unable to connect")