Two transactional email providers, compared on price, features and ratings, so you can pick fast.
Updated October 2026
THE VERDICT
Mailjet wins on price and sending APIs. Postmark wins on reviews.
Mailjet starts at Free versus Postmark's $10. Postmark rates higher with developers (4.6 vs 3.9 on G2). Pick based on volume and team, and the scorecard below breaks down where each one leads.
Winner cells are tinted, green where Mailjet leads, violet where Postmark does.
FAQ
Mailjet starts at Free versus Postmark's $10. Because pricing models differ by tier, the cheaper option depends on your monthly volume, so compare the pricing rows in the scorecard above.
Mailjet's paid plans start at USD 9 per month for the Starter tier, which includes 8,000 emails per month and removes the free plan's daily sending limit. Higher tiers such as Essential and Premium add automation, segmentation, and dedicated IP options, and custom enterprise pricing is available. Pricing scales primarily by email volume.
Postmark offers a free developer plan that includes 100 emails per month. It does not require a credit card and does not expire, but sending stops once the 100 email limit is reached. This tier is intended for testing and development rather than production traffic.
Yes. Many teams route different message types through different providers or fail over between them. Courier lets you send through both behind a single API and switch providers without changing your code.
Why not both?
Use both behind one API.
Route Mailjet, Postmark, or both, and switch providers without changing your code. Courier sits in front of every channel.
Pricing, plans and feature availability as of October 2026 and may change. Ratings are aggregated from public review platforms. Mailjet is a Sinch product; Postmark is an ActiveCampaign product.