Heho, together with some colleagues i setup an email-sending-selftest (powered by openbsd, and partially opensmtpd ;-)) In case it is useful for some: https://www.email-security-scans.org/
Only thing keeping me from 10/10 at the moment is outbound MTA-STS and DANE checking. If anyone has taken a shot at adding that to opensmtpd (Maybe a filter before hitting the relay action or something?), i'd be happy to hear about that. :-) With best regards, Tobias
