[SURBL-Discuss] OT: RBL needed!

This Off topic but figured most of us all get hit with this stuff.

I am in need of a bit of help.

I got a whole bunch of open relays doing rumpelstiltskin(sic) attacks on both my main mailserver and my seconary MX server... hitting the secondary and making it throttle the main one.

Anyway is there a way to use some of these RBLs to basically deny these open relays to be able to even attempt these attacks?

I'm running Sendmail 8.12.11 on Linux... both these boxen run RH 6.2 and are really locked down against other attacks.

I use to just drop routes to these idiots but never a good solution IMNSHO 8*)

I looked through the sendmail FAQs and didn't find anything that was helpful.

Any idea would be more then welcome.