diff --git a/webui/model/mail/mail.php b/webui/model/mail/mail.php
index f5893429..4328e117 100644
--- a/webui/model/mail/mail.php
+++ b/webui/model/mail/mail.php
@@ -63,7 +63,7 @@ class ModelMailMail extends Model {
                }
 
                $connection->connect();
-               $connection->helo($smtphost);
+               $connection->helo(SMTP_DOMAIN);
 
             } catch (Exception $e) {
                $connection->__destruct();