PrintsPlus,
To me, it sounds like you could just make a counter in PrintShop Mail and have it start at 3000. So you could make a variable, and use the following expression:
COUNTER(3000,3000 + RECORD_COUNT(), 1, 5, True)
The counter will start at 3000, and will go up to 3000 + whatever number of records you have. It increments by 1 for every records, and has a minimum of 5 positions. The True means it will add leading zeroes, so you'll get 03000, 03001, etc...
Hope that helps!
Regards,
Raphaël Lalonde Lefebvre