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PEAR - Connecting newsletters and advertisers 🍐
Lob - A simple API to integrate print & mail solutions into your applications.
Newsletter Operating System - All-in-one dashboard to launch & grow your newsletter
PostGrid - Transform your Offline Communications. Use our fully-documented REST API to send personalized letters, checks, postcards and improve address accuracy.
Revue - The easiest way to create and send a curated newsletter
AmazingMail - Business print-mail solution