Mac OS X mail app stops working repeatedly

It seems to me that my mac os x mail.app is having some major issues with MobileMe/iCloud. To give a little bit of background issue, this is currently my only computer that is online/synced with iCloud. It was purchaced after I switched to iCloud, and it has only ever run Lion(never upgraded from a previous OS). When I set up my mail accounts, everything worked great. I have my icloud, gmail, and school email all present. After a few days, however, I noticed an exclamation point next to icloud, and that my inbox stopped updating. It turns out, the account magically became "offline." Turning it online worked again, but now it has happened for a 3rd time, and there is no option to turn it online. I have tried removing and recreating the account in mail.app, and it works for a day, but then this repeats. And I know for sure it is not the server settings(which are chosen automatically, by the way), because my android phone has worked flawlessly for several months with my mobileme/icloud account; even when I converted to icloud, I didn't have to change anything there.
This mail.app is getting quite annoying, especially because there is no error when I go to send an email, but the email never goes through, and on top of that, the email I typed does not appear anywhere in mail.app, or any of my icloud mail folders.
Has anybody run into the same problem?

Try this:
http://www.macstories.net/news/configure-an-icloud-email-account-on-snow-leopard /
I'm kinda in the same boat...my iPhone 4s (that is through my work) and my home iMac, iPad are running the latest OS so not an issue...however my MacBook for work (which also has my iTunes library on it) is still running Snow Leopard.
The fix about did the trick...and it's still loading them all, but it looks like it's bringing in all my stored emails that i'd been using since I created my .Mac account years and years ago.
Hope it helps!
Joshua

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