Issue
Editing an outgoing vmail message during initial QSY causes the message to be sent twice: 1. Copy 1 - the version before the edit
Copy 2 - the edited version!!
There must be a race condition.
Recommendation
While a message is being edited, sending of that message should be paused and locked.
If the message is already being sent, then it should be locked to prevent editing.
But it would be good to have an abort/cancel send button, so it can be canceled, and then deleted or edited.
Bug confirmed and now fixed for V12.
Thank you for reporting.