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Originally Posted by KevinH You need to make sure your using SMTP auth and *not* a secure connection for the SMTP part of things. Can you send to any domain? |
Not sure if this is the same issue I've seen with Outlook, but it seems Outlook 2003 doesn't like SMTP+TLS on port 25. I've only gotten Outlook to work with "old style" SSL port 465, that is SSL connection is negotiated first, then the SMTP session is started which is the reverse of SMTP+TLS on port 25.
You can enable this in postfix by enabling smtps in master.cf. Perhaps Zimbra should enable that in the postfix config by default?
Hope it helps...