Apple Mac Mail not connecting to osx mail server

Mac Mail osx client has problems connecting to the mail server.

I have tried reinstalling new certificate, resetting password , can access email on the web mac mail web client.

I am using a snow lepoard osx mail server.

The certificate is valid i checked it.

So how do i go about it fixing this issue , what troubleshooting steps as this is only affecting one user.
jay broitAsked:
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In the Mac in question, in Mac Mail, pull down the Window menu to Connection Doctor. Then hit Show Detail and Check Again. See if the resultant detail information gives you a clue as to the problem. If necessary copy and paste a copy here.

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