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

> >> 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.
> >
> > <pedant>
> >
> > This only covers the case where the from: contains more than one address. What
> > about the case where the from is a single address but different from the
> > sender?
> >
> > </pedant>

> He-he-he.

> Yes, so I'll also add that to the end of the paragraph after the grammar:

> OLD
>    Otherwise, both fields SHOULD appear.

> NEW
>    Otherwise, both fields SHOULD appear.  If the "Sender:" field
>    specifies a group, that group SHOULD NOT refer to more than
>    one mailbox.

> (Q: "SHOULD NOT", or "MUST NOT"?)

I think MUST NOT is appropriate here.

				Ned
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