Re: Update to RFC 5322 to allow "group" syntax in the "from" header

> On Mon, 2012-09-10, Barry Leiba wrote:

> > I have this change queued up:

> > OLD
> >    If the from field contains more than one address (mailbox or group) in the
> >    address-list, then the sender field, containing the field name "Sender" and a
> >    single mailbox or group specification, MUST appear in the message.

> > NEW
> >    If the from field contains more than one address (mailbox or group) in the
> >    address-list, then the sender field, containing the field name "Sender" and a
> >    single mailbox or group specification that refers to no more than
> > one mailbox,
> >    MUST appear in the message.

> Does this mean that an empty group counts as one "addr-spec" for
> the purposes of requiring a Sender: field?

No.

> If not, it sounds to me as if an IMAP or POP server downgrading for a
> legacy client will have to "violate" this rule since a downgraded
> From: field will normally have only an empty group with the
> UTF8 addr-spec hidden in the name of the group.

Correct.

> If that triggers
> the requirement for the server to create a Sender: field,

Unless I'm missing something, it doesn't trigger. The rule is "more than one",
not "other than one".

> the only
> thing available to put into it is the same empty group in the
> From: field.

I don't see why this would be required by this language.

				Ned
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