[Mailman-Users] Preserving S/MIME-Encoded Mail

Brad Knowles brad at shub-internet.org
Fri Jan 16 23:43:42 CET 2009

Grant Taylor wrote:

>> Don't change anything at all in any of the signed/encrypted part, just 
>> treat it as an opaque object and encapsulate the whole thing.
> It sounded like that is what Mailman already did and that by doing so 
> broke the signature.

I don't think it broke the signature, I think what happened is that it 
hasn't been encapsulated in the correct manner.

>                       I will have to go back and re-read if it is 
> possible to graft the existing MIME tree in to another larger MIME tree 
> with out invalidating it.

At the very least, you can do a message/rfc822 bodypart, and that should 
guarantee that the signature is not broken, assuming that there's no changes 
in whitespace encoding, etc....

However, I don't know how most MUAs would handle that in a signed message. 
A more intelligent encapsulation format should hopefully address that issue.

Brad Knowles
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