Customer.io - We make it easy to send emails triggered by user behavior. Build, measure and improve your emails to activate and retain users
Aritic Mail - Ariticmail is a transactional email delivery API for applications and enterprises.
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
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.
If No Reply - Simple email automation that works for Gmail
RealTime Email - RealTime Email provides email relevance by enabling marketers to respond to each recipient’s personal context.