Can't send mail in IMAP accounts after installing Mavericks. Incoming messages OK.

I'm unable to send mail in IMAP accounts after installing Mavericks.  Incoming is OK. Any suggestions on how to resolve, please?

I'm afraid that I have the very same problem. How did Apple not see this. Surly email is a major part of any opperating system and should have being more than double checked before releasing. I understand software glitches but this is a major pain in the backside. I'm totally stuck and can't use my macbook pro

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