A quick google suggests that IMAP4 is backwards compatible with IMAP2, so 4 would be my first choice based on that. For the actual guts of Zimbra I'll defer to the people who understand programming--and that's not me.
As to logging, zimbra.log should be your animal. It's the one that shows connections. So if you're not showing any attempts there, it's not getting through. Whether the problem is firewall or routing, or configuration at your CRM, I really couldn't say, but if Zimbra were spanking it down you would see an entry in zimbra.log.
Are you able to connect using IMAP from other external (WAN) IPs? For example, could you fire up Thunderbird (or your choice of IMAP client) at home and link in? It should be the same process that the CRM package is using...
__________________
Cheers,
Dan
|