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checking the logs today i have noticed a large number of warnings that i don;t fully understand:
the line in the logs looks like this:
[31/Jul/2007 17:00:20] pop: User mail.domain.dom\user<_a.t_>domain.dom doesn't exist. Attempt from IP address
where domain.dom is a valid domain hosted on my server and user is a valid user for that domain (and mail.domain.dom a valid domain alias).
These attempts are happening all from different ip's but all from ip's whose reverse dns lookup point to various domains under (Which, i don't know, might be providing internet access for some of my users).
Additionally these attempts are happening for 3 (out of 25) users of the same domain.
can someone clarify the meaning of the log entry?
is the username attempting to connect "mail.domain.dom\user"? If this is the case then it obviously fails because that is not a valid username. Or is the "mail.domain.dom" preceding the username there to indicate to which domain the user attempted to connect? If this was the case it should not fail....
Can someone clarify?

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I don't know an immediate answer, but you could very simply find out yourself: login with some variations of your user name and see how it ends up in the log...
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