mta-sts-query - retrieve MTA-STS policy of a domain

       Retrieve the MTA-STS policy of a domain and display the result on standard output. This diagnostic
       utility is also useful without Postfix.

       MTA-STS, specified in RFC 8461 [0], is a security standard for email servers. When a site configures
       MTA-STS, other mail servers can require the successful authentication of that site when forwarding mail
       there.

       Retrieve MTA-STS policy for dismail.de:

       mta-sts-querydismail.de

       mta-sts-query - retrieve MTA-STS policy of a domain

       0.
           SMTPMTAStrictTransportSecurity(MTA-STS): https://tools.ietf.org/html/rfc8461

postfix-mta-sts-resolver                           2025-03-10                                   MTA-STS-QUERY(1)

-h,--help
           show a help message and exit

       -v,--verbosityVERBOSITY
           set verbosity level: debug, info, warn (default), error, or fatal.

       DOMAIN
           domain for which to retrieve the MTA-STS policy

       KNOWN_VERSION
           latest known version (default: None)

mta-sts-daemon(1), mta-sts-daemon.yml(5)

mta-sts-query [OPTION]... DOMAIN [KNOWN_VERSION]