PostGrid - Transform your Offline Communications. Use our fully-documented REST API to send personalized letters, checks, postcards and improve address accuracy.
Growmail Automated Direct Mail - Growmail enables businesses to send letters and postcards instantly through Automated Direct Mail.
Lob - A simple API to integrate print & mail solutions into your applications.
Postalytics - Automated direct mail software that’s faster, smarter & better. Postalytics sends personalized direct mail from your CRM and analyzes delivery & response.
AmazingMail - Business print-mail solution
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.