Cannot receive IMAP email via Edge or 3G but can via any wi-fi

Hey everyone,
the subject pretty much says it all. I use my company's email, it's an IMAP account. Works perfectly via any wifi area, but never has via EDGE. I'm at the Apple Store trying it via 3G and it's not working either. Any suggestions or anyone else experience this?

It doesn't have anything to do with the server - and it happens for POP accounts as well. I work at a major university and have a POP account, and have the same problem. Mail will work fine on any WiFi network (my home, the university, random public hotpsots), but completely fail with "connection failed" message on 3G/EDGE.
Sat with the head of IT today for the university mail servers I use. Watched the iPhone hit the server on WiFi, but on 3G/EDGE, it was like the query never got to the mail server - no record of a connection at all.
So - I think there is either a major problem with how the 2.0 software handles a non-wifi connection in some cases, or it is an AT&T problem with the network connection. Either way, it is insanely frustrating, and clearly not a server problem on this end - I have used POP in Mac OS X mail for 5 years on this server, and for 3 years on a Palm Treo with ZERO issues.
Called AT&T tech support and talked to an iPhone specialist who was less than helpful. Gave me a case number and told me to call back with the head of IT on the phone with me. Not likely. Like the head of IT has nothing better to do than troubleshoot my iPhone.
I am considering returning the phone, as it is completely unreliable for mail.

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