

Customer.io is a leading customer engagement platform designed for organizations to create personalized customer journeys that engage, convert, and scale. Orchestrate messages across all channels, including email, in-app, SMS, push, and webhooks. Over 7,500+ companies, including Notion, Typeform, and Angi, rely on Customer.io to power their messaging needs.
Postmark delivers your transactional email to your customers, on time every time. Your emails are important, get them to the inbox. Trusted by thousands of developers, Postmark is a fast and reliable transactional email service.
SendGrid has developed a cloud based service that solves the challenge of email delivery by delivering emails on behalf of companies. SendGrid eliminates the complexity of sending email, saving time and money, while providing reliable delivery to the inbox. With over a decade of thought-leadership backed by a stellar record of delivering email, SendGrid is climbing to new heights.