Approval of mismatched headers [was: tlug: Anti-spam Vote]

["Stephen J. Turnbull" <turnbull@example.com>]

>>>>> "jb" == Jonathan Byrne <jq@example.com> writes:

    jb> On Thu, 25 Mar 1999, Klaus Kudielka wrote:
    >> Yes.
    >> 
    >> BTW, will the mail below be accepted or rejected?
    >> 
    >> From: the-address-i-am-subscribed-as
    >> Sender: a-different-address

    jb> We'll have to work that out.

Accept it if either is on the list.  The only way to verify would be
to check the sender's IP address, and that can't be done.  Compliant
headers could be forged by anybody, once they know a member's address.
And both possible mismatches are useful.

What Klaus wrote above is the way that an RFC-compliant mailer would
allow a member to use a guest account (eg, while traveling).

As for the reverse case, one RFC-correct way for a subscribed member
to "approve" a non-member's post would be

    Sender: member@example.com
    From: non-member@example.com

This would be a little too subtle for my taste.

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