Best Transactional & Developer Email
Email APIs for developers sending transactional emails at scale. Compare SendGrid, Postmark, Mailgun, and Resend for reliable email delivery.
Resend
Modern email API built for developers with React templates.
Postmark
Transactional email with best-in-class deliverability.
SendGrid (Twilio)
Email API for developers with transactional and marketing.
Mailgun
Email API for developers with sending and receiving.
Frequently Asked Questions
What is the best transactional email service?
Postmark has the best deliverability and fastest delivery. SendGrid is the most popular with the most features. Resend offers the best developer experience with React Email support.
Is SendGrid free?
SendGrid offers a free tier with 100 emails per day forever. For higher volume, paid plans start at $20/month. The free tier is suitable for small applications and testing.
What is the difference between transactional and marketing email?
Transactional emails are triggered by user actions (password resets, order confirmations) and sent to one recipient. Marketing emails are promotional campaigns sent to many subscribers. Most platforms handle one or the other better.
Which email API has the best deliverability?
Postmark is known for industry-leading deliverability rates. They focus exclusively on transactional email and maintain strong sender reputation. SendGrid also has excellent deliverability at scale.