diff --git a/deploy-chatmail/src/deploy_chatmail/__init__.py b/deploy-chatmail/src/deploy_chatmail/__init__.py
index 7b80fb8b..7158b449 100644
--- a/deploy-chatmail/src/deploy_chatmail/__init__.py
+++ b/deploy-chatmail/src/deploy_chatmail/__init__.py
@@ -245,7 +245,7 @@ def _configure_dovecot(mail_server: str, debug: bool = False) -> bool:
     return need_restart
 
 
-def _configure_nginx(domain: str, debug: bool = False) -> bool:
+def _configure_nginx(domain: str, mail_server: str) -> bool:
     """Configures nginx HTTP server."""
     need_restart = False
 
@@ -275,7 +275,7 @@ def _configure_nginx(domain: str, debug: bool = False) -> bool:
         user="root",
         group="root",
         mode="644",
-        config={"domain_name": domain},
+        config={"mail_server": mail_server},
     )
     need_restart |= mta_sts_config.changed
 
diff --git a/deploy-chatmail/src/deploy_chatmail/nginx/mta-sts.txt.j2 b/deploy-chatmail/src/deploy_chatmail/nginx/mta-sts.txt.j2
index fc60e936..34d117e7 100644
--- a/deploy-chatmail/src/deploy_chatmail/nginx/mta-sts.txt.j2
+++ b/deploy-chatmail/src/deploy_chatmail/nginx/mta-sts.txt.j2
@@ -1,4 +1,4 @@
 version: STSv1
 mode: enforce
-mx: {{ config.domain_name }}
+mx: {{ config.mail_server }}
 max_age: 2419200