Ok, that makes sense to me. However, there are a few examples in the
documentation that talk about doing checks in the exim acl_smtp_data acl
for the 'From:' header. I think someone needs to do some documentation
cleanup.
From the Mail::SPF::Query documentation in the examples/exim-acl :
spf_from_acl:
# Check header From:
warn set acl_m8 = ${address:$h_from:}
deny !acl = spf_check
warn message = Received-SPF: $acl_m8 ($acl_m7)
accept
In the Exim documentation in the doc/experimental-spec.txt :
You can now run SPF checks in incoming SMTP by using the "spf"
ACL condition in either the MAIL, RCPT or DATA ACLs.
Please respond to spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
To: spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
cc: (bcc: Dan Mitton/YD/RWDOE)
Subject: Re: [spf-discuss] SPF w/SRS
LSN: Not Relevant
User Filed as: Not a Record
On Tue, 30 Jan 2007 Dan_Mitton(_at_)Notes(_dot_)YMP(_dot_)GOV wrote:
Ok, so does this also imply that the 'MAIL FROM' should be checked by
SPF,
but that the 'From:' header should NOT be checked by SPF?
Yes. That is exactly what SPF RFC4408 says.
SPF is a protocol focusing on validating SMTP session input data.
The data that MUA (normal mail client end-users use) processes is
an email content data (composed of email header with multiple fields
such as "From:" and a body which maybe composed of multiple MIME parts).
MUA can only found about SMTP data if MTA added this info in - in
case of MAIL FROM, last such data should be added to the very top
of the header data in "Return-Path" field.
--
William Leibzon
Elan Networks
william(_at_)elan(_dot_)net
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