Well first, sorry for my confusion. Second, it wouldn't make any sense to add authentication to port 25 as no external server would be able to send you mail. A user is authenticated by logging into Zimbra via the web UI or a client such as Outlook, they can then send mail (locally and externally) via port 25 as they have already authenticated against the server - that is the normal operation of a mail server.
In actual fact, the correct port for submission by clients is port 587. You can get your users to use that port by doing the following:
In /opt/zimbra/postfix/conf/master.cf you will find three lines near the beginning of that file, they are commented out and if you uncomment them (make sure you preserve the white space at the beginning of the lines) and save the file (restart postfix) your clients will need authentication to send mail.
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Regards
Bill
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