greyscanner compliments 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 recipient address(es) is valid, and more. Offending hosts are flagged as 'trapped' in the spamd database.
WWW: https://bitbucket.org/jimrazmus/greyscanner/
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