Receiving Folders E-mail Problem

[MacMyDay]

I just replied to this in the Universal forum, yet seeing I have the Wizard it made more sense to post here. Basically, over the last 24 hours, my phone will download e-mail, yet only the headers. It will then say "Receiving Folders" and just hang there for ages, until an error comes up telling me to check my settings. My incoming e-mail comes from my own companies dedicated server, so I've certainly not changed anything. Has anyone had this problem before and been able to solve it?

Thanks in advance