I punted again.
It is RECOMMENDED that the <responsible-sender> be drawn from the
envelope using this algorithm:
The <responsible-sender> comes from the domain name of the "MAIL
FROM" envelope sender. When the envelope sender has no domain, a
client MUST use the HELO domain instead. If the HELO argument does
not provide an FQDN, SPF processing terminates with "unknown".
If SPF processing occurs after SMTP time, the envelope sender may
be obtained from the Return-Path header. If the Return-Path header
has no domain, a client MAY try to extract the HELO domain from the
Received headers. If the headers do not yield useful envelope
information, SPF processing terminates with "unknown".
However, the <responsible-sender> address MAY be drawn from an
alternative source. For example, an MUA may find it more convenient
to extract the <responsible-sender> from the Return-Path header or
from the Sender: header.
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Sender Permitted From: http://spf.pobox.com/
Archives at http://archives.listbox.com/spf-discuss/current/
Latest draft at http://spf.pobox.com/draft-mengwong-spf-02.9.5.txt
Wiki: http://spfwiki.infinitepenguins.net/pmwiki.php/SenderPermittedFrom/
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