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Brevo

Transactional email, campaigns and CRM on one platform.

What it is

Formerly Sendinblue. It combines transactional sending over API or SMTP with newsletters, marketing automation and a lightweight CRM. Its free plan does not cap the number of contacts, only the daily sends.

Best for

Mixing newsletter and transactional email without two services.

What the free plan includes

  • 300 emails per day
  • Unlimited contacts
  • Brevo logo on emails from the free plan
  • SMTP and API both available

Free plans change often. Confirm the limits on the official page before deciding.

Resend

Pick

A modern transactional email API for developers.

3,000 emails per month

Mailjet

Transactional and marketing sending with a collaborative editor.

6,000 emails per month

Mailtrap

A sandbox for testing email, plus real transactional sending.

4,000 emails per month for sending, plus a test sandbox