Add a Herald action to trigger "Must Encrypt" for mail
- Created a new Herald rule:
- Created a "dog task" (woof woof, unsecure) and a "duck task" (quack quack, secure).
- Viewed mail for both in bin/mail and web UI, saw appropriate security/encryption behavior.
- Viewed "Must Encrypt" in "Headers" tab for the duck mail, saw why the mail was encrypted (link to Herald rule).
Reviewed By: amckinley
Maniphest Tasks: T13053
Differential Revision: https://secure.phabricator.com/D18984