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Re: [Uta] I-D Action: draft-ietf-uta-rfc7525bis-07.txt

John Levine <johnl@taugh.com> Thu, 23 June 2022 18:02 UTC

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From: John Levine <johnl@taugh.com>
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Subject: Re: [Uta] I-D Action: draft-ietf-uta-rfc7525bis-07.txt
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It appears that Viktor Dukhovni  <uta@ietf.org> said:
>    - If the question is about the software stack, then:
>
>      * Any MTA that supports STARTTLS already supports both inbound.

Almost -- it needs to have a cert that matches its name and is signed
and/or matches the TLSA record. A lot of the default installations
I've seen still generate a self-signed cert. This isn't a huge burden
but it's not entirely trivial, particularly since the acme web
validation method doesn't work unless you can spin up a web server
with the same name as the mail server.

>      * Outbound support for MTA-STS is unlikely in the leading open source
>        MTAs
>      * Outbound support for DANE is starting to be available even in
>        some of the cloud provider stacks, but is not yet prevalent.

Yup.  I think that publishing stuff for inbound mta-sts is worth it
since for most people a large fraction of incoming mail will check it.

R's,
John

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