First, is this a new problem and you were receiving mail fine before? Or is this still your first installation? (Like I assume based on thread location.)
I gather you mean un-checking DNS lookups helped.
While I know you're talking about incoming - do you use a relay for outgoing mail?
Incoming Mail Problems - Zimbra :: Wiki Quote:
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An alternative to setting up a DNS server is to un-check "Enable DNS Lookups" on the MTA tab under Server configuration on the Zimbra Admin console. This requires a relay MTA to be configured somewhere that will accept all outbound email.
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I see that your probably using a mailhop service (ISP blocking port 25) but don't actually state if you have implemented that yet.
Also see another thread by you on setting up a split dns - everything working properly with that? (What I suspect is not working.)
Another option is manual setting of zimbraMailTransport.
To check the reason they are differed examine your /var/log/zimbra.log or:
su - zimbra
mailq
(postsuper/postqueue commands are also helpful)
Fixed for 5.0.6:
Bug 27537 - Mail Queue message informationr pop up does not work in 5.x