Remotely send your documents directly to the U.S. Post Office through our cloud-based mailroom. DocuSend works with any accounting, billing or CRM software that produces PDF documents containing a valid mailing address. Users can upload directly or developers can integrate our REST API to offer a "Send Mail" button in their software, either as a reseller or for internal direct connectivity. There are enormous economic advantages for any business or organization that needs to safely print and mail documents on-demand.