added postfix_message_size_limit

roles/mail/defaults/main.yml

@@ -34,3 +34,5 @@ static_mail_domains: []
 
 # Final destination address for abuse@ postmaster@ and similar.
 abuse_destination_addr: "root@{{ domain }}"
+
+postfix_message_size_limit: 20971520

roles/mail/templates/main.cf.base.j2

@@ -43,3 +43,5 @@ default_database_type = cdb
 indexed = ${default_database_type}:${config_directory}/
 #pcre = pcre:${config_directory}/
 #ldap = proxy:ldap:/etc/postfix/ldap/
+
+message_size_limit = {{ postfix_message_size_limit }}

roles/mail/templates/postfix-out/main.cf

@@ -48,9 +48,6 @@ transport_maps = ${ldap}all-recipients ${indexed}transport ${indexed}mailman_tra
 # resolve aliases
 virtual_alias_maps = ${indexed}virtual ${ldap}aliases
 
-# Message size limit.
-message_size_limit = 20971520
-
 # Concurrency tuning for "relay" and "smtp" transport.
 relay_destination_concurrency_limit = 20
 default_destination_concurrency_limit = 20