What types of envelopes does Billtrust use to mail print bills?

The Billtrust system uses page count to determine the type of envelope for mailing documents.

• #10 Envelopes (1-5 pages, and business reply envelope)
• 6x9 (6-12 pages)
• Flats (13-50 pages)
• Priority Mail (51+ pages, tracking not reflected in SmartTrak)