https://bugs.kde.org/show_bug.cgi?id=300142
--- Comment #15 from Mike Jones dr.mike.jo...@gmail.com ---
(In reply to Mike Jones from comment #14)
(In reply to Pierre Maraval from comment #12)
Same problem on Kubuntu 13.10, Kmail Version 4.11.5.
Another aspect of this bug (I think) is that Kmail doesn't digitally sign
the html signature correctly (HTML signature with inline images
(data:image/gif;base64) ).
So the sent signed email is invalid, even for other clients which otherwise
can render html signatures in Kmail-sent mails.
Re Pierre's data:image additional point.
I can confirm that (for kde 4.10.5 and kde 4.13.3) the addition of images
via the img src=data:... to an html signature causes s/mime signing to
record an incorrect digest. I notice that when the mail is sent the
saved/received mail has its html image elements converted to img
src=cid:... which are I believe generated on the fly. My best guess is
that perhaps kmail reformats the html after the digest is calculated
rendering it void.
To test this I have created two identity profiles the only difference being
their name and whether the html signature contains img data block or not.
The result is that after signing the email with the images in the signature
(both saved locally and sent over the wire) result in a red message box and
Status: Bad signature; whereas emails sent without images render in a
green box and verify correctly.
Additionally Adding a vcard (generated via kmail which inserts \r\n as per spec
IIRC). There may also be an issue with either kmail or MS exchange (though I
doubt MS would want to remove it's precious carriage return character)
replacing \r with \n resulting in \n\n substitution for \r\n, and hence voiding
the digest again.
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