MS Exchange server corrupting PGP-MIME emails

Peter Lebbing peter at
Sat Oct 29 14:39:19 CEST 2011

On 29/10/11 13:31, Jerry wrote:
> Thank you. I sort of have a contact at Microsoft that might be able to
> lend me some assistance. However, I would need very specific
> information.

Wouldn't the more generally applicable fix be to simply *not* mess with the
layout of messages going through the server? Changing encoding is one thing, and
I believe the MIME spec says stuff about this being accepted, but rewriting the
whole structure and changing inline parts to attachment parts and stuff like
that seems like a sure-fire way to screw up all sorts of different things, not
just PGP/MIME and S/MIME.

Be liberal in what you accept, but *be conservative in what you create*. Plus,
it is not in the interest of the user to mangle their messages. If the recipient
would like to see it formatted in a certain way, he needs a MUA to do that for
him, it is explicitly not the task of the MTA. The SMTP spec has some stuff to
say about this too.


I use the GNU Privacy Guard (GnuPG) in combination with Enigmail.
You can send me encrypted mail if you want some privacy.
My key is available at

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