Can you also telnet to port 25 from your LAN? Can you send an email through Zimbra by that method? Do you have SElinux installed/active? If you do, disable it. Are you absolutely positive that all the required ports for Zimbra are passed through the firewall?
Have you done a search through the forums for this issue? There's probably more info here at present than in the wiki.
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Regards
Bill
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