[MlMt] Mailmate hangs on error, instead of proceeding with othe accounts

[William P. N. Smith]

Every once in a while MailMate gets confused about one of my accounts 
and throws the attached error:

Or something similar.

And then my other accounts, and my junk mail filtering, and everything 
else comes to a screeching halt until I hit “Retry”.

Bug, feature, misconfiguration?  Is there a workaround?

Thanks!
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