Urgent, being used as spam relay Please Help!

>We have just been used as a smtp relay for one of the US spam companies and
>it crashed one of our mail servers, the service remained unaffected as our
>backup systems took over but we use sendmail and I cannot seem to find out
>how to stop us from being used in this fashion.
>
>I know this is not the correct list for this sort of thing but I need some
>expert advice as our software suppliers don't know how to stop it.
>
>As a general warning to everyone out there we need to protect our systems
>from these people who are starting to use us all to deliver their mail for
>them without paying us a penny.


hi.

question: do you need to relay mail anyway? if not, reconfigure sendmail not
to relay mail anymore. we did include code to stop sendmail from relaying on
our own system, i am willing to forward you the code fragment... you should
compile it yourself though.
its the most effective way i know of. you can also achieve this by editing
sendmail.cf as far as i know, yet i am not an expert at the config file... i
am more the coder type of guy :)

sincerely
jens knoell
twinwave ingelheim
(jens at twinwave.net)