Greetings, as of now the MX for mailop.org offers a MTA-STS policy (see: <https://mta-sts.mailop.org/.well-known/mta-sts.txt>) as defined in RFC 8461 <https://tools.ietf.org/rfc/rfc8461.txt>.
This allows us to receive reports via TLSRPT (see: RFC 8640 <https://tools.ietf.org/rfc/rfc8460.txt>), which will let us see if there are STARTTLS, MTA-STS or DANE related problems when sending messages to the mailop.org SMTP service. At the moment the SMTP server itself supports STARTTLS and DANE. We plan to add MTA-STS when the feature becomes available. Regards, p@rick -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG,80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief Aufsichtsratsvorsitzender: Florian Kirstein
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