Merge branch 't26108-force-tls-smtp' into 'main'

Prefer TLS SMTP | refs #26108

See merge request sys/ansible-public!19

roles/postfix/templates/main.cf.j2

@@ -16,6 +16,7 @@ smtpd_use_tls = yes
 smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination
 smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
 smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache
+smtp_tls_security_level = may
 
 # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
 # information on enabling SSL in the smtp client.