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MTA-STS-DAEMON(1) mta-sts-daemon MTA-STS-DAEMON(1)

mta-sts-daemon - provide MTA-STS policy to Postfix as policy map

mta-sts-daemon [OPTION]...

This daemon opens a socket where Postfix can query and retrieve the MTA-STS policy for a domain. The configuration file is described in mta-sts-daemon.yml(5).

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.

-h, --help

show a help message and exit

-v, --verbosity VERBOSITY

set log verbosity level: debug, info (default), warn, error, or fatal.

-c, --config FILE

config file location (default: /etc/mta-sts-daemon.yml)

-l, --logfile FILE

log file location (default: none)

--disable-uvloop

do not use uvloop even if it is available (default: enabled if available)

Configure Postfix in /etc/postfix/main.cf:

smtp_tls_policy_maps = socketmap:inet:127.0.0.1:8461:postfix
smtp_tls_CApath = /etc/ssl/certs/

Reload Postfix. Then verify it works:

/usr/sbin/postmap -q dismail.de socketmap:inet:127.0.0.1:8461:postfix

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

0.

SMTP MTA Strict Transport Security (MTA-STS): <https://tools.ietf.org/html/rfc8461>
2024-08-25 postfix-mta-sts-resolver