SPF Milter – milter for SPF verification

Another very niche project of mine … a milter that does SPF verification.


SPF is a protocol for checking whether some email-sending host is really allowed to use some mail domain, according to information published in the DNS (RFC 7208). A milter is a plugin for sendmail-like mail servers such as Postfix, to be used as a UNIX daemon/system service.

This project may be interesting to you if you run a mail server, or are otherwise interested in older email technologies. Or just if you fancy reading a little bit of Rust code … Feedback welcome.

Thanks for reading.