Maybe I'm missing something, but why would you want to do this rather
than a DKIM signature? �DKIM validates against the DNS, and protects
the whole message.
because I can have a proper configured domain, I can properly sign my
mails but I can send you an email with From: paypal.com header !
DKIM does not protect you against this !
I get the impression that you haven't read the very, very, very
extensive discussion on the DKIM list about how DKIM and/or ADSP do or
do not "protect" the address on the From: line, and what if anything
to do about it. Please do so. The archives are here:
http://mipassoc.org/pipermail/ietf-dkim/
It would also be worth taking a look at the archives of the earlier
MARID WG which also considered similar issues. Its archives are here:
http://www.imc.org/ietf-mxcomp/mail-archive/
R's,
John
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