When you've installed Zimbra and disabled qmail, do the zimbra services start? Have you done a 'zmcontrol status' (as 'su - zimbra') and if so what does it say? Can you telnet to your zimbra server on port 25 on the server itself and from other PC on the LAN?
If the zimbra services are running there should be no reason other apps can't send mail.
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Regards
Bill
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