Mac Mail/Comcast Issues

Hello all,
So I just recently changed my email password with comcast, then updated all my info with my Mac and phone and iPad-now I can receive emails through my comcast account, but cannot send any. Comcast says it's Apple's fault...
The OS keeps telling my the username and password don't match up (but I know it's right) and my mac tells me the smtp is offline...
Does anyone have a quick and easy solution to this?
Thank you!
Jon

Go to Applications/Utilities/Keychain Access and delete your e-mail account password.
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