Re: Update to RFC 5322 to allow "group" syntax in the "from" header - how about sender?

> The sender and resent-sender headers have the same issue on
> downgrade.  The current syntax says they contain a mailbox.
>
> I suppose that since they're optional a downgrade could just delete
> them, but if we're allowing null groups in From, how about null groups
> in Sender and Resent-Sender, too?

I need to go dig back and see why the issue only came up with From,
and not with Sender.  If it's an oversight, then you're right.  In any
case, conceptually, there's no reason why the "sender" of the message
couldn't be a group.

And just to clarify, this change is not just allowing *null* groups:
it's a change to allow *any* groups at all, null or otherwise.

Barry
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