diff --git a/core/nginx/conf/nginx.conf b/core/nginx/conf/nginx.conf
index 17d6752..eced2c4 100644
--- a/core/nginx/conf/nginx.conf
+++ b/core/nginx/conf/nginx.conf
@@ -245,7 +245,7 @@ mail {
       listen 465 ssl;
       listen [::]:465 ssl;
       protocol smtp;
-      smtp_auth plain;
+      smtp_auth plain login;
     }
 
     server {