s/qmail/DOC/rblsmtpdについて、ここに記述してください。
https://www.fehcom.de/ipnet/ucspi-tcp6/rblsmtpd.html
rblsmtpd - block mail from RBL-listed sites and unwanted sources
- Interrogation Mode
rblsmtpd may be used to only query RBLs and to present the results to qmail-smtpd in an interrogation mode.
- -i interrogation mode; the RBL information is written on descriptor 2 and available via RBLSMTPD for further decisions.
Greetdelay Options
7.6 Greylisting in qmail-smtpd