Perl daemon that complements OpenBSD spamd(8) greylisting by applying additional heuristics to greylisted hosts.
Additional heuristics include:
- confirm senders email address is valid
- confirm existence of the senders MX or A record in DNS
- confirm validity of recipient address(es)
- and more
Offending hosts are flagged as 'trapped' in the spamd database.
20131205 - Version 1.02 released with a bug fix.
20090611 - Version 1.01 is available in the OpenBSD ports tree under mail/greyscanner.
Debugging instructions are available in the Developer Documentation.