Pete,
PR> You will note that I did not say "from *a user in* some domain" or
PR> "from *an e-mail address in* some domain". I said "from some domain".
Yes, I did notice that. Unfortunately, the concern stands.
There is a fundamental difference between having an authority
relationship between two fields -- such as RFC2822.Sender _setting_
RFC2821.MailFrom -- versus requiring any portion of the values in the
two fields to be the same.
For example, legitimate bounce-handling, for legitimate (subscription)
bulk mail, has become a specialty, and often must be handled by
specialists.
Further, requiring that a protocol enforce administrative string values in the
domain name space -- such as the values that can be in RFC2821.MailFrom
-- is a pretty serious decision.
Note, for example, that there is no such value-constraint between
RFC2822.From and RFC2822.Sender.
d/
--
Dave Crocker <mailto:dcrocker(_at_)brandenburg(_dot_)com>
Brandenburg InternetWorking <http://www.brandenburg.com>
Sunnyvale, CA USA <tel:+1.408.246.8253>, <fax:+1.866.358.5301>