Michel Bouissou wrote:
we could simply recommend that MUAs SHOULD display the
<Return-Path> as well as the "From: " header field
Yes, I like this. I'd recommend to treat MAIL FROM != From
_without_ Sender like MAIL FROM == Sender. This would
solve a SPF classic / Sender-Id incompatibility for legacy
software.
For "MAIL FROM" read "address minus old routing stuff", for
"!= From" read "does not match any From address", and for
"== Sender" read "matches the Sender address". Bye, Frank