Require TLS 1.2 for outgoing SMTP connections

Author: link2xt

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## untagged
 
+- Require TLS 1.2 for outgoing SMTP connections
+  ([#685](https://github.com/chatmail/relay/pull/685))
+
 - filtermail: run CPU-intensive handle_DATA in a thread pool executor
   ([#676](https://github.com/chatmail/relay/pull/676))
 

cmdeploy/src/cmdeploy/postfix/main.cf.j2

@@ -26,6 +26,7 @@ smtp_tls_security_level=verify
 smtp_tls_servername = hostname
 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
 smtp_tls_policy_maps = inline:{nauta.cu=may}
+smtp_tls_protocols = >=TLSv1.2
 smtpd_tls_protocols = >=TLSv1.2
 
 # Disable anonymous cipher suites