From: Scott Kitterman [mailto:spf2(_at_)kitterman(_dot_)com]
Sent: Wednesday, August 17, 2005 10:38 PM
Now what I was trying to suggest was something much simpler than many of
these options.
Give domain owners who do not want their 2822-From: (or 2822-Sender:
perhaps) used with someone else's 2821-Mail From:.
Domains that want to impose this restriction add from=yes to their SPF
record.
Any domain that opts in to this gives up the ability to participate in
mailing lists. That is a heavy price to pay. If you make it From: _or_
Sender:, when it exists, you still get what you want while allowing those
domains to post to mailing lists.
--
Seth Goodman