--On Sunday, September 09, 2012 11:33 -0400 Barry Leiba
<barryleiba@xxxxxxxxxxxx> wrote:
>...
> Rats; I missed this in earlier review:
>
> -- Section 3.2.1 --
>
> This procedure may generate empty <group> elements in
> "From:", "Sender:" and "Reply-To:" header fields.
> [I-D.leiba-5322upd-from-group] updates [RFC5322] to allow
> (empty) <group> elements in "From:", "Sender:" and
> "Reply-To:" header fields.
>
> It does not. It adds group syntax to "From" only. Group
> syntax is already allowed in "Reply-To", and the draft does
> not change the rules for "Sender".
>
> If this spec also needs "Sender" to change, I can update the
> 5322upd-from-group for that, but it's not there now.
Barry, I think it does. The presumption (since before 822) has
been that "Sender:" can contain any address that can appear in
"From:". The ancient history is that "From:" need not even
contain a deliverable address if "Sender:" is specified to match
a business correspondence model in which:
From: "Big boss who doesn't use computers"
Sender: Assistanct-to-boss@xxxxxxxxxxx
has to be legitimate. 5322 and its predecessors took some of
that capability away, but the only difference now is that
"From:" can take a list of mailboxes and "Sender:" can take only
one.
I think 5322upd-from-group needs to apply to both
backward-pointing address types to be effective for what
popimap-downgrade needs.
Sorry for not finding this in my reviews -- I should have.
john