IOS 5.1 Email not updating on certain WiFi networks

All of a sudden, all my iOS devices have stopped updating email on my school's wifi network. All other internet connections are fine (can get on safari, youtube, etc), but Mail does not update. I tried changing the port, but it just kept Verifying and wouldn't change. Unsure if there is something with iOS 5.1 (only started affecting me yesterday. I have tried rebooting my iPad, as well as re-adding the network, but nothing worked. Email still works fine on all other networks I use. Any suggestions?

It could be the network, but what surprises me is that nothing else is being blocked at all. And I can't seem to change the port that Mail is on. I tried a port scan, and it came up that that port is blocked (993), but it also came up that every other port I tried was also blocked. I used a Mac to do a Port Scan for my iPad's IP, but it wasn't detecting any open ports. So I don't know if it is an issue with the network, or perhaps with my iOS devices. The network has 802.1X security I believe (I need a username and password to login), so unsure if this would affect it at all?

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