!!SPAM などの ブラックリストで有名な Spamhaus の Tips

! sendmail に登録して使う
 MC ファイルに
 FEATURE(dnsbl,`zen.spamhaus.org', `"550 rejected, see relays zen.spamhaus.org"')
 ## FEATURE(dnsbl,`sbl.spamhaus.org', `"550 rejected, see relays sbl.spamhaus.org"')
 ## FEATURE(dnsbl,`pbl.spamhaus.org', `"550 rejected, see relays pbl.spamhaus.org"')
 ## FEATURE(dnsbl,`xbl.spamhaus.org', `"550 rejected, see relays xbl.spamhaus.org"')
 を追加

 dig +short 10.100.228.210.zen.spamhaus.org
 ##dig +short 10.100.228.210.xbl.spamhaus.org
 ##dig +short 10.100.228.210.sbl.spamhaus.org
 ##dig +short 10.100.228.210.pbl.spamhaus.org

!Apendix
https://www.spamhaus.org/faq/section/DNSBL%20Usage#366

https://www.spamhaus.org/organization/dnsblusage/