Steps:
# Go to some paste (for example: P11)
# Click "Subscribe"
# Wait while somebody add a comment to it
# Open email notification:
<nickname> added a comment.
<details>
REPLY HANDLER ACTIONS
Reply to comment or !unsubscribe.
To: <nickname>
Cc: <nickname1>, <nickname2>, ..., <nicknameN>
5. This notification doesn't contain link to paste