Just about everyone business, needs to send mail. And depending on how tightly your business is tied to mail, you may want to look at outsourcing the process instead of entering into pricey multi-year leases for Pitney Bowes mailing equipment.
I found two (2) companies that will print, envelope, and mail your letters on your behalf. Each company provides a Web API that allows you to send your letters securely. They inturn, print and mail your letters.
Both companies provide HIPAA compliance if your business touches the US healthcare space with pricing that begins around $1 US per letter mailed.