Looking at the steps required to carry out the proposed unmunging, "a lot
easier" doesn't seem to be an accurate measurement.
In python it's about two lines since there are well debugged libraries
to handle MIME. Same in most other languages.
I agree, the code to do this is easy and well tested, and it works so long
as the MLM is doing the mutation in exactly the same way the verifier will
undo it. The concern comes down to two different MIME library implementers
disagreeing on their choices for where an extra newline might be helpful,
for example.
I was actually thinking of wrapping the original message as an attachment,
sort of like a one-message digest. You can always recover the original
message, the problem is that MUAs display attached messages badly, and if
you unwrap you lose the useful changes the list manager makes like subject
tags and footers with unsubscribe instructions.
Regards,
John Levine, [email protected], Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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