finding a spammer relaying through sendmail
derek at computinginnovations.com
Tue Apr 14 19:59:56 UTC 2015
I have had this happen too. Even though testing of my server shows it is
not an open relay. There are 3 configuration files that are used for the
various functions of sendmail. I looked at those files versus the defaults
that are installed by mergemaster. I reverted to the defaults as much as
possible, and kept only the few customizations I needed. That cut out
those relays at least for me.
I also use sma to generate a daily report on the sendmail log. You can use
that report to block users or domains.
At 11:53 PM 4/13/2015, David Banning wrote:
>I have around 40 email users on my system, and one seems have had their
>login info stolen. Is there a way to determine which user is being given
>authorization to relay through sendmail? I have increased sendmail logging
>to 15 but the sender is flagged only as an email address, one unknwon to me.
>Any pointers would be helpful.
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