Email over wifi at work

I'm having some issues getting email to work on my iphone over wifi. When I am at home, everything works using my wireless network. When I'm at work however, Safari, Youtube and Google Maps work great (really fast actually)...however my email (which is set up for gmail) won't connect to the server.
Basically it stays stuck on "checking for mail". Sometimes it will stay there indefinitely...other times, after a few minutes, it will give a message about the connection to pop.gmail.com failing. It also won't send email. It stays stuck on "sending..." for a few minutes then says "Cannot Send Mail. The connection to the server smtp.gmail.com" failed."
The main difference between my wireless network at home and at work is that in order to use the internet on my iphone at all at work, i first have to go to an internal website in safari and enter a user name and password. I did ask one of our IT guys and he told me that wireless account is in the DMZ so it shouldn't be blocking any of the ports.
I don't get much (usually none at all) signal for at&t in my office. However, if I go somewhere that I get signal and turn off the wifi, everything works fine. It sort of sounds to me like it's trying to use EDGE just for email, but really I have no clue.
Any ideas?

Man was I glad to find your post. I have been having the exact problem since yesterday using Network Sharing (wifi) from my imac to both my iphone and mbp. I thought it was a .mac problem because they have been having issues and .mac is the only mail account I have on iphone and mbp.
I had been using it successfully with all options checked in the advanced pane of the firewall settings, that is udp, logging, and stealth. So when I saw your post I turned off the firewall, sent a test mssg, and it worked. Turned firewall back on, sent another test mssg, and it still worked. Then it stopped working again! I posted in the ".mac on your desktop forum" earlier today and sent two mssgs to support.
I only recently learned of Network Sharing and was glad I wouldn't have to get an airport base station just to share wifi with my (then only) MBP. But with this and the fact that Network Sharing only allows WEP and not WPA I guess I will have to shell out the bucks.
Could Network sharing have a limitation of just one device? I never had a problem until I got the iPhone and started using it in addition to the MBP to receive wifi from my imac.
Basically it stays stuck on "checking for mail".
I get this with a home network where I'm using a
computer's built Airport as a wireless router (WiFi)
to share an ethernet internet connection (personal
web sharing). It turns out I can only get email on
the iPhone when the built-in Firewall is turned
off...not acceptable. I probably need to enable some
port, but enabling the available ports with the
built-in firewall does not help. Also found UDP
traffic cannot be blocked to get web access at all.
Might need a more sophisticated firewall, but will
probably just get a dedicated wireless router
(Airport) and then things should work ok. If that
makes sense...

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