It appears that William Weiner  <[email protected]> said:
>Tero,
>
>+1 to hashing MIME parts separately. 

We have considered this in the past and rejected it because it makes the diff 
and
reconstruction vastly more complicated and fragile.

>A Recipe that can undo a removal has to carry the removed content forward. If 
>a safety filter strips a
>malicious content, the removed content travels on in the Message-Instance 
>headers, and anything that
>reconstructs would put it back. A filter whose purpose is removal will choose 
>a null body Recipe and
>under -09 that means the message cannot be fully verified.

Please see the previous hundred messages or so on that topic addressing why 
that's not a problem.

R's,
John
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