Realtime Block List (RBL) - qmail-dnsbl
A Realtime Block List (RBL) is a list of addresses that an RBL list supplier believes are a source of Spam. Update as of Oct 28, 2022: added a note on how to avoid being cutoff by spamhaus (tx Marco Varanda) Download qmail-dnsbl patch Code...
Playing with qmail-spp
qmail-spp provides plug-in support for qmail-smtpd. It allows you to write external programs and use them to check SMTP command argument validity. The plug-in can trigger several actions, like denying a command with an error message, logging data, adding a header...
Adding clamav-unofficial-sigs
More info here Version: 7.2.5 The clamav-unofficial-sigs script provides a simple way to download, test, and update third-party signature databases provided by Sanesecurity, FOXHOLE, OITC, Scamnailer, BOFHLAND, CRDF, Porcupine, Securiteinfo, MalwarePatrol, Yara-Rules Project, urlhaus, etc. The script will also generate and install cron,...
Limiting the number of emails sent by a given auth-user/domain/IP
If you want to avoid the risk of compromising your server because of accounts who are sending messages indiscriminately to the world, due to the fact that their password have been violated in some way, then you can consider Luca Franceschini's...
