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...
Denying bad DNS HELO/EHLOs
Changelog Aug 17, 2023- C++ version Aug 13, 2023- v. 8.2.0 bug fix: segfault in case of no result in DNS record- default action changed to GNLR Jul 27, 2023- P will now pass through making all filters ignored. You are invited to remove this option...
Greylisting for qmail
Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again after...
