I am new to the boards having only just joined last week. I am sending out my very first DV letters today via CMRRR to the following CAs:
Ox Collection - DirecTV
Data Solution Collection - DirecTV (duplicate of above invalid debt)
Unique National Collection - Library late fees
None of these debts are at all valid because the debts were PIF long ago (before they ever got to the CA stage). I will update later to let everyone know how it goes!