The proposal is to preserve the original message + DKIM signature and to
add the new (probably partially rewritten) output message, combined into
a multipart/alternative structure. The combined message is sent by the
MLM to the recipient.
Once again, I can only see this as screwing up the 99+% of users for
whom the lists work just fine for the <1% who consider themselves so
important that they need to mark their list mail with ADSP.
Imagine you're a list manager. Your list has 1000 subscribers. Two
of them demand that you do something to prevent address forgery due to
forged unsigned messages, a problem that you have never observed to
happen on your lists. What do you do? I know what I'd do.
R's,
John
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