I know it's possible to bring back a deleted message by changing a parameter in the ACCOUNTS folder in the STATUS.txt file. Exemple:
cea2f3d0,+N,N,N,MSG00479,{43f94e2f-7020-4a97-9d10-2d0818b9d467},M
cea2fde7,+O,N,N,MSG00479,{43f94e2f-7020-4a97-9d10-2d0818b9d467},M...