Re: empty from, was Review of draft-kucherawy-dmarc-base-04

"John Levine" <johnl@taugh.com> Wed, 23 April 2014 22:54 UTC

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Date: Wed, 23 Apr 2014 22:53:53 -0000
Message-ID: <20140423225353.28640.qmail@joyce.lan>
From: John Levine <johnl@taugh.com>
To: ietf@ietf.org
Subject: Re: empty from, was Review of draft-kucherawy-dmarc-base-04
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>> Well, except http://tools.ietf.org/html/rfc6854

>I do not see anything in that doc that makes it valid to have a From 
>field with no domain name.

Section 2.1:

   from = "From:" (mailbox-list / address-list) CRLF

In RFC 5322 sec 3.4:

   address-list    =   (address *("," address)) / obs-addr-list
   address         =   mailbox / group
   group           =   display-name ":" [group-list] ";" [CFWS]

So this is valid:

 From:  Redacted for your own good :;

That's deliberate; the use case we had in mind is EAI mail downgraded
by a POP or IMAP server where there's no way to turn the EAI address
into an ASCII address.


R's,
John