I have been driven nuts by this message popping up on my iMac and my MacBookPro.  It was present in OSX 10.8 and 10.9.  It has been going on since at least two service packs ago and neither of them fixed it.

The error occurs on a standard hosted email, configured as IMAP.  The error does not occur when Outlook is in focus, or if I press 'Send/Receive. When I do this, mail is sent and received normally without errors. So I know the authentication is correct. But whenever I resume working from sleep, or Outlook is hidden, the error is on screen when I return to the program.

So far I have followed various instructions to fix it:
  • Change outgoing server port to 587
  • Change outgoing server authentication from 'Same as Incoming Server' to specified username/password
  • Change password
  • Delete password entry from keychain 
  • Delete entire account from Outlook and recreate

Deleting the account is the most recent thing I tried. I have an Exchange Account, two IMAP accounts and a iCloud account. The error occurred on one of the IMAP accounts. When I deleted this account, I started getting it on the iCloud account. When I deleted this, I got it on the other IMAP account!!

I have no idea what is going on but it is REALLY annoying now!  Any suggestions would be very welcome.

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