Version:           4.8.x (using KDE 4.8.0) 
OS:                Linux

Sending an email to participant of an meeting failed due to invalid address.

Reproducible: Didn't try

Steps to Reproduce:
Steps to reproduce:
1.) Create an invitation with at least one participant with email-address forename.lastname@company.de. Response yes if system asks to send email to the participant of the meeting.

2.) The generated email cannot be sent due to the following error
Fehler beim Übertragen der Nachricht. Mailversand fehlgeschlagen, da die folgende Empfängeradresse vom Server abgelehnt wurde: <forname.lastname@company.de> (Meldung des Servers: Address syntax error: <<forname.lastname@company.de>>). 
This error message says sending of the email failed due to an invalid email-address. The server responded with: "Invalid address <<forname.lastname@company.de>>.

3. If I open the email in the outbox and re-send it without changing anything the email can be sent. The receiver email is displayed correctly without the <<>>.


Add. Info:
 1) The addresses stored in an akonnadi-gcal resource. 
 2) The behavior is always reproducable for all invitations. 
 3) The behavior came with Kmail2.



Expected Results:  
The email is sent without an error message.