abuse.rfc-ignorant.org
dsn.rfc-ignorant.org

At least from my experience, while the rfc-ignorant.org lists are great in theory, they cause enough problems with end users that they're not worth it. The last ISP I worked at used them (the sys admin was the walking definition of a BOFH), and as the help desk manager, I got stuck trying to explain to people why they couldn't get mail from their friend on Prodigy when everyone else in the world could receive mail from them just fine. I still use the dsn list on my personal server, but it rarely hits since it's checked after Spamhaus's SBL/XBL list and dynablock.njabl.org.

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