Title.Name.PartyAffiliation.Subject.LetterType.Sending.SendingDate.

As you send it the save name will change.

​Ex:
​
Original letter:
      Gov.Snyder.R.FOIA.3.25.16

The third sending you will add .ts to the end of the save:
      Gov.Snyder.R.FOIA.3.25.16.ts

The last save will be when you send the Thank you and you will change the end to .ty:
      Gov.Snyder.R.FOIA.3.25.16.ty