Mail Activity but mail not delivered

Mail 5.0, Lion
I see Mail Activity (10 messages) but mail not delivered. This repeats at check mail intervals.
It was working fine - and now it doesn't.
Any thoughts?
Kind Regards
Hugh

Me too suddenly stop sending or recieving any of yahoo messeges first on my Macbook pro then i enabled the keychain for sync in my mobileMe then it comes to my iMac ,,,, same issue,

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