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Re: [Emailcore] Ticket #8: Need a registry of header fields that are Ok to add after submission

John Levine <johnl@taugh.com> Wed, 18 November 2020 02:54 UTC

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From: John Levine <johnl@taugh.com>
To: emailcore@ietf.org
Cc: ned.freed@mrochek.com
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Subject: Re: [Emailcore] Ticket #8: Need a registry of header fields that are Ok to add after submission
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In article <01RS3ULW3EE6005PTU@mauve.mrochek.com> you write:
>> On 16/11/2020 18:10, Alexey Melnikov wrote:
>> >
>> > IANA is requested to create a new subregistry for email header fields that can
>> > be added to a message header section by a “relay” and/or “delivery” SMTP
>> > system. The new subregistry would show whether a header field can be added by a
>> > “relay”, “delivery” system or both.

This is, as I think is fairly obvious, really the same topic as the
forwarding and mailing list headers one.

I think we can come up with a fairly short list of headers that are
fixed by submission time (I agree we don't try to distinguish between
MUA and MSA.) Anything else can be added when a message is relayed or
delivered up to the maxmum number of each header allowed, typically
one.  I also don't think it's useful to try to distinguish at this level
between relay and delivery since for a lot of MTAs (mine for example)
the distinction is pretty fuzzy.

There is a very short list of headers that can be deleted or replaced
when a message is relayed, currently just Authentication-Results.

This has approximately nothing to do with mailing lists which create a
new message by editing the incoming message in all of the fun and
exciting ways we know.

R's,
John

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