Trac ticket notifications

Raymond Toy <[email protected]>
Newsgroups gmane.lisp.common-lisp-net.devel
Message-ID <[email protected]>
This used to work and I don't know when it stopped working, but
whenever I create (or modify?) a ticket, I get an message displayed
with the ticket:

Warning: The ticket has been created, but an error occurred while
sending notifications: {u'[email protected]': (550, 'Verification
failed for <[email protected]>\nUnknown user\nSender verify
failed'), u'[email protected]': (550, 'Sender verify
failed')} 

Not quite sure what this is trying to tell me,  

Actually until very recently, as an admin, I used to receive messages
to allow messages to be sent to [email protected], even for
my own tickets. A bit annoying, but it worked.  Now I get nothing.

Hints or help would be greatly appreciated.

--
Ray
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