the djb way: you've got spam!

Daniel Bernstein's manual page for the rblsmtpd program.

Daniel Bernstein's manual page for the rbldns program.

The Multi-RBL check page, lists a number of RBLs, with a web interface to check if a specific IP address is included among them.

Other RBLs

Here are just a few publicly available, free or donation-supported, RBL resources at the time of this writing (fall 2004):

RBL Service	Information	RBL basename
SPEWS	http://www.spews.org/	none publicly available; see S0RBS below
S0RBS	http://www.dnsbl.us.sorbs.net/	many, including: `spam.dnsbl.sorbs.net` `smtp.dnsbl.sorbs.net` `l2.spews.dnsbl.sorbs.net`
SpamHaus	http://www.spamhaus.org/	`sbl.spamhaus.org` `xbl.spamhaus.org` `sbl-xbl.spamhaus.org`
AHBL	http://www.ahbl.org/	`dnsbl.ahbl.org`
DSBL	http://dsbl.org/	`list.dsbl.org` `multihop.dsbl.org`
SpamCop	http://www.spamcop.net/	`bl.spamcop.net`
NJABL.org	njabl.org	`dnsbl.njabl.org`

Chris Wilkes' has this great HOWTO document for setting up your own rbldns service.

the djb way