Greg Connor wrote:
Question 1.
Is there a required correlation between MAIL FROM and the header fields?
No. Just compare Sender (or however your mailer provides MAIL FROM) and
From in this message.
Sender is the mailing list. From: is Me. Both are fully correct.
Trying to say "Sender MUST EQUAL From:" will prevent the use of SRS and
thus cripple SPF.
As-is, however, SPF provides some soft of accountability on Sender
without tampering with the message body. In doing so it clarifies the
meaning of Mail From as "agent responsible for sending" without
compromising the human-usable meaning of Header From.
Correlation between the two headers is no concern for SPF. If it needs
flagging, it can be done in the mail client or by prepending warning
notes as the message passes through the MTA.
There are situations where a difference between the two is correct. If
we try and prevent this we wreck the adoption of SPF.
Wechsler
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Details: http://spfwiki.infinitepenguins.net/
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