On Thu, Nov 17, 2011 at 11:21:49PM +0100, P. Mazart wrote:
> Stas Verberkt schrieb am 17.11.2011 14:43:46:
> > Nevertheless, disabling the "clear text" mode is not really an option,
> > as this would render all my e-mails unreadable by those using older
> > e-mailclients or e-mailclients on smartphones.
>
> Actually we might not have an idea, what “clear text” mode is…
I believe in this case Outlook uses S/MIME multipart/signed, so the
signature is in a separate body part and clients without S/MIME
support can still read the text/plain part of the message.
The other way Outlook can send signed messages (with "clear text"
disabled) involves wrapping the signature *and* text into some sort of
PKCS binary blob, which obviously causes a lot of trouble with other
clients.
-Dave Dodge
