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

> I have just posted draft-leiba-5322upd-from-group-04:
>    http://datatracker.ietf.org/doc/draft-leiba-5322upd-from-group/

> That changes the definition of Sender as well as From, and also adds a
> new "Applicability Statement" section that has an edited version of
> some text suggested by John Klensin (thanks, John).  I like the
> result, and I hope others do as well: it makes it clearer that we're
> not recommending the general use of group syntax in From and Sender,
> but are enabling it for limited use in certain situations (of which
> the EAI use case is so far the only one).

> Further comments before I ask Pete to run a formal last call on this?

It occurs to me that now that sender has changed from

    sender = mailbox

to

    sender = address

Since address can be a group, and a group can contain multiple addresses, we've
left a crack through which the syntax allows multiple address to slip into a
sender field.

I suppose we could define sender as something like this:

    sender = mailbox / (display-name ":" (mailbox / CFWS) ";" [CFWS])

But this seems kinda ugly to me. I think a note to the effect that at most one
address can appear in a sender group construct would suffice.

Aside from that, this document looks spot on to me.

				Ned
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