nginx: be more specific with the server name (#636)

CHANGELOG.md

@@ -8,6 +8,9 @@
 - don't use the complicated logging module in filtermail to exclude a potential source of errors. 
   ([#674](https://github.com/chatmail/relay/pull/674))
 
+- Specify nginx.conf to only handle `mail_domain`, www, and mta-sts domains
+  ([#636](https://github.com/chatmail/relay/pull/636))
+
 - Setup TURN server
   ([#621](https://github.com/chatmail/relay/pull/621))
 

cmdeploy/src/cmdeploy/nginx/nginx.conf.j2

@@ -66,7 +66,7 @@ http {
 
 		index index.html index.htm;
 
-		server_name _;
+		server_name {{ config.domain_name }} www.{{ config.domain_name }} mta-sts.{{ config.domain_name }};
 
 		access_log syslog:server=unix:/dev/log,facility=local7;