If I'm at an airport lounge kiosk and I send email, it can either
admit that it came from airportloungekiosk.wherever, or I can connect
to Panix and send mail from there. Otherwise, if _I_ can send mail
claiming to be from <sethb(_at_)panix(_dot_)com> from the kiosk, so could you
(or
a spammer), and I don't want that.
Um, why?
If I authenticate to Panix.com, you should trust that I'm sending legit mail
through you, whatever domain I'm using to send it, or you should revoke my
ability to authenticate.
Trust the people you contract service for. Don't contract service for the
untrustworthy.
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