Best Email APIs for Developers in 2026
Compare Resend, SendGrid, Postmark, and AWS SES. Developer experience, free tiers, and deliverability compared.
Last updated: February 2026 · 3 tools reviewed
1
Resend
Developer-first email API for sending transactional and marketing emails with React Email support.
2
Kit (formerly ConvertKit)
Email-first operating system for creators to grow an audience, send broadcasts, automate campaigns, and sell digital products.
3
Mailchimp
Email and SMS marketing platform for creating campaigns, automations, audience segments, forms, analytics, and integrations.
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