I tried following this wiki on restricting distribution lists to certain senders, but there were a few steps that I couldn't complete.
RestrictPostfixRecipients - Zimbra :: Wiki
For instance, I don't have the file: /opt/zimbra/conf/postfix_recipient_restrictions.cf
or this one: /opt/zimbra/conf/zmmta.cf
Is the wiki out of date, or am I missing something?
Any help would be greatly appreciated. Thanks!