SphereMail - Automate access to your postal incoming mail and packages
Click2Mail - Mail outsourcing on-demand.
AmazingMail - Business print-mail solution
Lob - A simple API to integrate print & mail solutions into your applications.
PostGrid - Transform your Offline Communications. Use our fully-documented REST API to send personalized letters, checks, postcards and improve address accuracy.
Sendoso - Sendoso’s B2B engagement platform helps companies accelerate sales and retain customers with gifts and rewards.