Outgoing mail has stopped working on iMac.

My outgoing mail has suddenly stopped working on my iMac. It works on my laptop and phone. Says "Cannot send message using server smpt.comcast.net
The server response was: Authentication required.
I hadn't changed anything in preferences, so I hesitate to do so now.
Help please!!

My Grin wrote:
I have been through all of the troubleshooting steps recommended by Apple.
Well you still have not stated what you did.
I would recommend re-inputting all of your account preferences as I advised in your other post in this thread:
https://discussions.apple.com/message/25429854#25429854

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http://support.apple.com/kb/TS3899
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http://ipadhelp.com/ipad-help/ipad-cant-send-emails-troubleshooting-steps/
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Outgoing mail has stopped working on iMac.

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