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Re: [Emailcore] Delivered-To issues

John Levine <johnl@taugh.com> Thu, 31 December 2020 22:33 UTC

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From: John Levine <johnl@taugh.com>
To: emailcore@ietf.org
Cc: dcrocker@bbiw.net
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Subject: Re: [Emailcore] Delivered-To issues
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In article <4bc00e40-8a18-0c8c-bf1e-672e91da2330@dcrocker.net> you write:
>I think I've got enough information to formulate an initial draft, for 
>people to shoot at, except for:
>
>
>1.  Why a separate header field, rather than Received's FOR clause?

What jck said, the mailbox into which a message is delivered often has
a different name from what was in the RCPT TO.  That's particularly
likely on systems that handle mail for multiple domains.

>2. What should it say about delivery to multiple recipients?
>
>    The easiest -- and probably most problematic, for some systems that 
>share access to a single copy of the message -- is to say it must only 
>contain one address.  If the spec says something else, what should it 
>be, and why?

I think at this point we'd be making stuff up because I've never seen a
Delivered-To for multiple recipients.  I'm inclined to follow what sec
4.4 of RFC5321 says and only report one recipient address.

R's,
John

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