Cannot receive mail from .Mac account on port 143

I use my laptop at work. I used to have a 12" Powerbook G4 running OS X 10.4.3. I had no problem receiving mail from my .Mac account. Now, and all of a sudden, I can no longer receive my .Mac mail using the Mail app. The error I get is:
The server "mail.mac.com" refused to allow a connection on port 143.
I called AppleCare about this issue last night and they told me to perform the following steps:
1. Choose .Mac in System Preferences and delete my username and password from the Account tab.
2. Move com.apple.mail.plist and the Mail folder from my ~/Library folder to the desktop.
3. Restart the Mail app and re-import the Mail folder from the desktop. I was told not to directly copy the Mail folder from the desktop into the ~/Library folder.
4. Go back into .Mac in System Preferences and re-enter my account information.
According to AppleCare, things should now work. But there's a little problem with this "solution." I spoke with my network admin and he told me that incoming traffic on port 143 is blocked. That being the case, I fail to see how any of the above steps will solve my problem. It seems nothing more than an issue of trying to get my network admin to open port 143 and he seems reluctant to do that.
Any feedback would be appreciated.
Thanks,
Richard

I've solved this problem. Well, actually, I didn't do anything other than:
1) Rebooting my computer, then...
2) Following the instructions at the top of the following thread to re-create my email accounts (I had two):
http://discussions.apple.com/message.jspa?messageID=1598309#1598309
Not sure what this fixed, and how I got into this issue in the first place.
I had four or five days worth of email to come in... it took...
...a...
...long...
...time...
But its looking like its working.
A few things I tried, and although they didn't have an immediate effect to fix the connection refused problem, they might have kicked something to start something working again:
1) Created a new 'test' user on the system, restarted, logged in as that user, and started Mail.app setting it up with .Mac settings (it was after this everything worked)
2) Changed SSL ports in the accounts settings (no difference)
3) Turned firewall on and off (no difference)
4) Attempted to use Thunderbird to read .Mac email as IMAP mailbox (didn't work)
Hope this rather obvious help helps anyone else

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Cannot receive mail from .Mac account on port 143

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