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Re: [ietf-smtp] Endless debate on IP literals

2020-01-02 12:07:16
On 1/2/2020 9:03 AM, John R Levine wrote:
Agreed.  I do think there's a few things like STARTTLS that need to move into the mandatory core, but not many.

To beat this point into the ground, just to make sure there is no confusion: since starttls isn't in rfc5321...

The target documents would be:

   1) Astreamlined rfc5321bis

2) A document specifying requirements for Exterior MTAs, which would include mandating rfc5321bis, starttls, ...

   3) Possibly a document specifying requirements for Interior MTAs?

My impression is that there's some amount of desire to restrict use of IP literals in EHLO [*] to interior mtas, and prohibiting them from exterior mtas.

If that assessment is roughly correct, it would mean that rfc5321bis would specify /only/ support for domain names in the EHLO command, with an Interior MTA document specifying an enhancement to the command, to allow use of IP literals.


[*] whether and where to deprecate HELO is a separate issue needing similar consideration for scope of use.

Dave Crocker
Brandenburg InternetWorking

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