This morning, Monday June 12th, 2017, I pushed an update to the messaging system and various supporting files to add few features as requested.
1 - Notifications:
The system now sends notifications of new messages. In the 'My Account' page, I changed the old 'feedback form preferences' functionality with Messaging preferences.
If you click the link you'll have 5 options.
1 - Never
2 - Weekly Notification (default)
3 - Daily notification
4 - Send copies of received messages
5 - Send copies of received and sent messages.
If you choose 4 or 5 the messages themselves will be your notification.
So, two requested features rolled into one. Message copying and pending messages notification.
2 - Message Deletion: You can now delete messages in your inbox.