My e-mail doesn't work on iphone 4 [3g AT&T]?

Need help. One of my e-mail accounts stopped working (no receiving, no sending) on my iPhone 4 a couple of days ago. Other e-mail accounts (ex.gmail, yahoo) work just fine. It only doesn't work on AT&T 3G network, works fine on my home wi-fi. I guess there's something blocking access to that specific account, I have no problem accessing it from my Mac or other computer, it just doesn't work on iPhone 3G network specifically (while other accounts work just fine). Settings on that account were not changed. Is there anything I could do to fix the problem? Any help would be greatly appreciated.

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