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Mail.app through smtp.mac.com outgoing server. For some reason, I can't connect to the server this morning.
 
Just to clarify, are you still on .Mac or have you been transitioned to Mobile Me? You should be on Mobile Me, but I just want to make sure. Also, have you tried changing everything to Mobile Me addresses?

Incoming: mail.me.com
Outgoing: smtp.me.com

http://www.apple.com/mobileme/setup/pc/
 
Can't connect to either smtp.mac.com or smtp.me.com

Was working fine last night.

Connecting to mail.mac.com just fine for incoming, but not to the smtp server. SSL using port 993 for IMAP though I have tried turning that off too.
 
Could have been an isolated issue. .Mac/Mobile Me and its users have had a long couple of weeks with this move. Glad it's working again.
 
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