diff --git a/core/nginx/conf/nginx.conf b/core/nginx/conf/nginx.conf
index dfd38164..85853faa 100644
--- a/core/nginx/conf/nginx.conf
+++ b/core/nginx/conf/nginx.conf
@@ -251,7 +251,7 @@ mail {
       starttls only;
       {% endif %}
       protocol smtp;
-      smtp_auth plain;
+      smtp_auth plain login;
     }
 
     {% if TLS %}