= spam/対策/dnsbl =
について、ここに記述してください。

Realtime Blackhole List (RBL) - qmail-dnsbl

https://notes.sagredo.eu/en/qmail-notes-185/realtime-blackhole-list-rbl-qmail-dnsbl-162.html

This patch replaces the djb's rblsmtpd program. It incorporates into qmail-smtpd the rbl stuff with the advantage that you can see the envelope in the logs. Registering the envelope as well as the sender ip is important to always know what happened to not received messages.

http://qmail-dnsbl.sourceforge.net/