Bug 325821

Whenever I click on "Accept" onto an email I receive from my colleagues (who all use Windoze Outlook agains an Exchange Server), kmail2 creates TWO outgoing mails:
one is the real "accepted" mail, and the problem is the second one:
It is the same mail I received, with the same "From:" and "To:" Headers.
So whenever I receive an invitation and accept it, it gets delivered to all recipients again - including myself ...

The sent mail seems not to be excatly a 1:1 copy of the original mail however, as I find e.g. the header
User-Agent: KOrganizer/4.11 (Linux/3.7.10-1.16-desktop; KDE/4.11.2; x86_64; )
and an attachment with:
--nextPart1428619.I5Sl7TypH6
Content-Type: text/calendar; charset="utf-8"; method="request"; name="cal.ics"
Content-Disposition: attachment
Content-Transfer-Encoding: quoted-printable

BEGIN:VCALENDAR
PRODID:-//K Desktop Environment//NONSGML libkcal 4.3//EN
VERSION:2.0
...

I can provide the mails in private but I don't want to attach them here.

Reproducible: Always



Expected Results:  
kmail2 must never send the original mail again.