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This is related to bug 1190906 whose code was *poorly* 
written by me (ie. the fix assumed a dict result whereas 
the mailer code stringifies it) 
 
A quick hack fix would be to look for "unknown user 
account" in the error string. 
 
I suspect a better fix would be to squash and ignore any 
smtplib.SMTPException raised during the bounce_message 
call in mailer. 
 
What do you think?