Mail for Snow Leopard won't stop loading

One of my accounts (@zoho.com) cannot seem to stop loading, while the other one works just fine. This is not the first time this has happened, and usually i just delete/re-add the account but it doesn't seem to work this time. I am using IMAP and cannot see any patterns in how the problem starts.

Anybody familiar with this problem?

The thing that is most weird about this is that my iPad/iPhone doesn't have any problems at all with loading/receiving emails...