NAME

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

SYNOPSIS

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

DESCRIPTION

       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.

OPTIONS

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

       -v, --verbosity VERBOSITY
           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)

EXAMPLES

       Retrieve MTA-STS policy for dismail.de:

       mta-sts-query dismail.de

SEE ALSO

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

NOTES

       0.
           SMTP MTA Strict Transport Security (MTA-STS): https://tools.ietf.org/html/rfc8461