Steps to reproduce:

1. create new email
2. activate "Absichern->signieren" (aktivate sign) in GPG4win-Pluging; I didn't activate "Absichern->verschlüsseln" (dont't activate encrypt);
3. open any contact from outlook adress book;
4. go into E-Mail Field and copy E-Mail Adress into clipboard (with control c)
5. paste clipboard content into the "An" field of the new email

Result: Text will not be shown in "An" field. Outlook immedeatly crashes. Error Box (see attachment{F196392}) suggests to deactivate the gpgol plugin.

This behavier is 100% reproducible on my machine

Other tests:
a) between step 4 and 5: copy clipboard content in a text editor or any other app. From there copy content again and past it into the email. Works perfectly
b) modify step 2 and deactivate "Absichern=> signieren". Works perfectly