"Mark Simcoe" <msimcoe@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@tcp.net.uk Network Manager | Play: phil@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