[SURBL-Discuss] OT: RBL needed!
Jeff Chan
jeffc at surbl.org
Fri May 28 15:11:59 CEST 2004
On Friday, May 28, 2004, 6:55:23 AM, Doc Schneider wrote:
> 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.
Many people use and recommend list.dsbl.org and xbl.spamhaus.org
(or sbl-xbl.spamhaus.org) to block open relays at the MTA level.
(sbl-xbl is a combined list of sbl and xbl. ;-)
We find them quite effective.
Here are my mailserver.mc (m4) confs:
FEATURE(dnsbl,`sbl.spamhaus.org',`"Address "$&{client_addr}" blocked. See http://www.spamhaus.org/sbl/"')dnl
FEATURE(dnsbl,`xbl.spamhaus.org',`"Address "$&{client_addr}" blocked. See http://www.spamhaus.org/xbl/"')dnl
FEATURE(dnsbl,`list.dsbl.org',`"Open relay "$&{client_addr}" blocked. See http://dsbl.org/sender"')dnl
Jeff C.
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