Thank you monkfish for helping me track down the problem, I've stumbled upon another problem now though, when trying to send emails from my domain, to for example hotmail or gmail; I get an error when I try to send it
Message not sent. Server replied:
Requested action aborted: error in processing
451 4.3.0 <**********@gmail.com>: Temporary lookup failure
Any idea what might be the problem?