# Best Email API Services

Compare email API services, including SendGrid, Mailgun, Postmark, Resend, Amazon SES, MailerSend, SocketLabs, and Customer.io.

Email API services should give developers reliable sending, clear API documentation, delivery events, templates, suppression handling, and enough observability to debug email issues quickly.

## Ranked Tools

1. **SendGrid** — Email API and delivery infrastructure — https://shipboost.io/tools/sendgrid
2. **Mailgun** — Transactional email APIs for developers — https://shipboost.io/tools/mailgun
3. **Postmark** — Fast transactional email delivery — https://shipboost.io/tools/postmark
4. **Resend** — Developer-first email API for products — https://shipboost.io/tools/resend
5. **Amazon SES** — Scalable email sending on AWS — https://shipboost.io/tools/amazon-ses
6. **MailerSend** — Transactional email for product teams — https://shipboost.io/tools/mailersend
7. **SocketLabs** — Email delivery and deliverability platform — https://shipboost.io/tools/socketlabs
8. **Customer.io** — Customer messaging and lifecycle email — https://shipboost.io/tools/customer-io

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Source: https://shipboost.io/best/email-api-services
Markdown: https://shipboost.io/best/email-api-services.md