Urgent, being used as spam relay Please Help!

"Mark Simcoe" <msimcoe at netcentral.co.uk> said;
>
>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.

Whilst a quick addition of a router access-list to filter all traffic
from the source will temporarily stop the problem, you (and everyone) need 
a more permanent solution.

>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.

I would strongly encourage everyone on this list to urgently review
their mail systems, and make sure they have some anti-relay measures
installed. For Sendmail, see http://www.sendmail.org/antispam.html,
and for more general information, http://spam.abuse.net/

With the growing popularity of the MAPS RBL (http://maps.vix.com),
sites not taking the right precautions will find themselves filtered
from more and more of the Internet.

-- 
Phil Dye                        | Work: pmd at tcp.net.uk
Network Manager                 | Play: phil at lart.ing.co.uk
Total Connectivity Providers    | Consider myself properly disclaimed 
"The nice thing about standards is that there are so many to choose from" -anon