Mailzak - Give a boost to your #EmailMarketing
Lob - A simple API to integrate print & mail solutions into your applications.
rasa.io - Get more from your email list.
PostGrid - Transform your Offline Communications. Use our fully-documented REST API to send personalized letters, checks, postcards and improve address accuracy.
Mailblast - Email marketing on a budget using Amazon SES
Growmail Automated Direct Mail - Growmail enables businesses to send letters and postcards instantly through Automated Direct Mail.