Mobile Me & mail.app "Cannot be contacted on port 143"

Hi all,
After moving from SF to Miami I've recently been having problems with my me.com account in mail.app . Upon launching mail, the me.com account is always ofline (and my three other accounts are always online and working fine). When I click the "!" icon it returns the message "The server cannot be contacted on port 143". The strange thing is that after about 15 minutes emails finally seem to get through and the account is back online. Is there any way the account settings could be changed so the emails come in right upon launching mail?
Any help is greatly appreciated!
Cheers,
datlocin

Welcome to the Apple Community.
Delete your mail account from Mail preferences and set it up again using the Mail Server Information.
Some users have apparently encountered issues using this information in pre-Lion set ups (I haven't), Roger Wilmut has kindly provided instructions for those who find themselves with this problem.
Entering iCloud email settings manually in Snow Leopard or Leopard
Entering iCloud email settings manually in Tiger

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Working with expresslane the issue I was bucked up
to sr. level - they found the problem is 's changeover
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Mobile Me & mail.app "Cannot be contacted on port 143"

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