Problem:
I sent out an encrypted Email and I want to recall it or make it expired for the recipient since I did a mistake.
Solution:
1. Locate message in the outbound message log using a search by from/to/subject
2. Go into the message details and scroll down to the bottom of the page
3. Click on the Expire Encrypted Thread link
4. The email in the message log will show Delivered (Expired) as the status afterwards
