Cactus Mailing - Cactus Mailing offers direct mail and postcard marketing services.
Lob - A simple API to integrate print & mail solutions into your applications.
Click2Mail - Mail outsourcing on-demand.
Stannp - Stannp helps to create and send postal Direct Mail campaigns: letters or postcards.
PostcardMania - PostcardMania specializes in results-driven multichannel marketing, offering simple and streamlined solutions that include everything from custom campaigns to plug-and-play automations that trigger highly personalized mail pieces.
PostGrid - Transform your Offline Communications. Use our fully-documented REST API to send personalized letters, checks, postcards and improve address accuracy.