diff --git a/nginx.conf b/nginx.conf
index 3dab7e1..f89d81a 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -112,11 +112,11 @@ stream {
     
     # Upstream mail server
     upstream mail_submission {
-        server 10.0.0.21:25;
+        server 10.0.0.21:10025;
     }
     
     upstream mail_smtps {
-        server 10.0.0.21:25;
+        server 10.0.0.21:10025;
     }
     
     # SMTP Submission port (STARTTLS) - port 587