Arnt,
So, yes, your description does indeed sound simple, but that to be
because you left out all of the interesting stuff.
AG> Well, it's _possible_ to leave out the interesting stuff if that's
AG> defined as a local matter.
If it were strictly a local matter, it would not need to be published
in the DNS.
The problem is that the receiving SMTP server is required to interpret
the SPF policy that is published by a sender some indeterminate number
of MTA hops upstream.
That is very much NOT local.
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>