Hello,
While someone was beginning to write their code for TLSRPT, they noticed that
mx-host-pattern is under specified.
o "mx-host-pattern": The pattern of MX hostnames from the applied
policy. It is provided as a string, and is interpreted in the
same manner as the "Checking of Wildcard Certificates" rules in
Section 6.4.3 of [RFC6125]. In the case of Internationalized
Domain Names ([RFC5891]), the domain MUST consist of the Punycode-
encoded A-labels ([RFC3492]) and not the U-labels.
https://tools.ietf.org/html/draft-ietf-uta-smtp-tlsrpt-23#section-4.4
So, the questions arises when for instance one is using MTA-STS and has two MX
allowed patterns and how that should be noted in the report field. I'd like to
suggest we use a JSON array, as the report is already in JSON. An alternate
would be a simple string. I wanted to see if the WG had any objections to this
change.
Thanks for your time.
--
Alex Brotman
Sr. Engineer, Anti-Abuse
Comcast
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