Perhaps it makes more sense to flat-out reject such messages, on the same
grounds that you would reject malformed SMTP commands. One could have a
rejection message that says "violates RFC2822" (with possibly more detail
like "multiple subject lines").
What does an MTA do with even more-malformed messages? Could I "legally"
submit line noise to an MTA and expect it to deliver it? Or does it just
invoke the LDA to drop the gibberish in the user's mailbox and hope the
MUA can make sense of it?
(I still think the sender needs to be hit with a cluestick.)
I think rejecting may be draconian but it would be interesting to track the
amount of legitimate mail with two subject headers. I can see a lot of
filters/gateways accidentally adding this to legitimate mail, unfortunately.
However, David, I think if the headers are being actually deleted, they
should instead be renamed and retained. X-SUBJECT-DUPLICATE1: or something.
I guess since I've never dealt much with legitimate mail with duplicate
headers, I wasn't even aware of this as a problem.
Regards,
KAM
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