Thunder Mail - Cheap and simple transactional emails API with Amazon SES

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.

MailClark - The Slack bot for external communications

Mail Shark - Mail Shark is one of the leading platforms that offer Marketing Programs, Printing, and Direct Mail Advertising services to customers all across the globe.

PigeonBot - Send emails via Slack with the /email command

Every Door Direct Mail - Every Door Direct Mail is a Marketing Resource Management Service from Vya that enables you to provide customized and meaningful direct mail campaigns each time.