DocuSend

No need to venture out using DocuSend's cloud based print-to-mail service. We eliminate stamps, envelopes, forms, labor, equipment, and trips to public mail receptacles, so you remain safely at your desk/home office. Users simply print invoices to PDF file(s) and upload. Your documents are mailed the next business day. There is no minimum, commitment, or data requirement. A free QuickBooks Online app is available, as well as, API integration opportunities for software developers.