Problem downloading mail on IMAP

[#1]

Hi,
I'm having issues syncing mail using IMAP.  I get an error of "TCP connection unexpectadly terminated by the server."
It then seems to download my mail, but each e-mail in Outlook has the same subject, but the contents are fine.  If I use the webmail, the e-mails are fine.
I've checked the service status, and the latest problem that was from Monday is apparently fixed.  Is anyone else having issues with e-mail at the moment?
Cheers
Griff

[#2]

.. I get that.. my firewall (Smoothwall Express 3) keeps blocking port 14300. But as I don't know all the pnet mail servers' ip addresses I can't exclude them

[#3]

It seems ok on my iphone, just not in Outlook.  I've got access through the firewall ok, and it's been working fine for ages.
It seemed to happen when I recieved an e-mail with an attachment.  After that all my e-mails started coming down with the same subject and header info, even though the contents were fine.
I've created a new mailbox, and that seems to be doing the same too.  I might try deleting the mailbox/settings out of outlook and recreating them.

[#4]

RELATED?
I have noticed of late my Magic Mail monitor programme <http://sourceforge.net/projects/mmm3/>, which monitors multiple e mail accounts, cannot connect with the Plus Net e mail server. <mail.plus.net>. I wonder if there has been some configuration change.
http://sourceforge.net/dbimage.php?id=62399

[#5]

Whilst there have been a few config changes of late, there's nothing that I would attribute to either of the problems you're seeing?
@Griff, did you get to the bottom of your problem? I'd be interested to know whether or not you experience the same problem in another mail client like Thunderbird? @Gel, there was bit of blip last Tuesday afternoon (13th) but aside from that I can't think why your client wouldn't be able to connect to the server.