Do AI agents pick Postmark?
How often agents choose Postmark when a developer needs transactional email — measured across Claude, GPT, Gemini.
95% CI 10%–19%
When developers ask an AI agent for transactional email, Postmark is picked 14% of the time — ranking #1 of 5 measured across Claude, GPT, Gemini.
1.0M package downloads / week
0 docs in FineWeb · 325 URLs in Common Crawl
4.0M installs / month ▲ 14% MoM
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The per-model and per-surface breakdown for Postmark — where it wins, where it loses, and to whom — plus an alert when the Pick Rate moves.
About Postmark
A transactional email delivery service focused on high deliverability rates.
Postmark is a transactional email service that handles sending application emails—such as password resets, receipts, and notifications—with an emphasis on reliable inbox delivery. It provides bounce and spam processing, detailed sending statistics, and can also parse incoming emails and forward them to your application. It's aimed at developers and teams who need dependable delivery for time-sensitive transactional messages.
Where to start
Sign up for a Postmark account to get an API key, then use the official Node.js library or the REST API directly to start sending. The Postmark developer docs cover API details, while the postmark.js wiki provides a quick-start guide.
The rest of the Transactional Email ranking
| 2 | Resend | 12% |
| 3 | SendGrid | 9% |
| 4 | Amazon SES | 0% |
| 5 | Mailgun | 0% |