Kontact 4.11.2 generates two mails when responding to an event

Hi all,

another rather strange problem I've encountered while testing Kontact 4.11.2 
(Kubuntu 13.10):

- I receive an invitation (from an e35-KMail, in case that matters)
- I click "Accept" (or "Decline")
- I get a message saying that an e-mail has successfully been sent - and 
indeed, the organiser does receive the response!
- Then the selection dialogue for the calendar I want to put the event in pops 
up (I have three calendars, all Kolab V2)
- The moment I select a calendar, I get another message stating that an e-mail 
could not be sent due to the sender not being allowed (our Kolab server is 
configured to deny sending mails with a sender/from differing from your own).
- Local Folders/outbox now contains a *copy* of the *original* event 
invitation (with my status correctly been shown as "Accepted" or "Declined" 
with - obviously - the sender/from being the organiser.

I have disabled - for now - the "Delete invitation mails after replay has been 
sent", but that does not seem to make any difference. "Sent copy to owner when 
mailing events" is also off.

Any ideas? Before filing a bug report, I would like to figure out whether this 
might just be a configuration issue...

Regards,

Thomas

P.S.: Given that this is another potential show-stopper and as I'm not 100% 
sure whether this is maybe a Kolab-related issue, I've taken the liberty of 
sending a similar mail to kolab-users as well
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	Thomas Ribbrock, IT-Team brightsight
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