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Aritic Mail - Ariticmail is a transactional email delivery API for applications and enterprises.
PushMarket - Automate personalized emails for ecommerce (YC15)
Smartech - Smartech is a AI-powered Cross-channel Marketing Automation & Analytics Suite. It helps marketers and product managers LISTEN to and ANALYSE consumer behavior, and execute hyper-personalised campaigns to retain and engage users (CONVERSE).
InboxSDK - First usable API to write Gmail Apps for 1B active users
Amazon SES - Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.