Configuring Postmark API

Setup Guide for Transactional Email Delivery (2026)

Postmark is a fast, developer-first transactional email service. To connect your platform, you only need two pieces of information: your Server Token and a Verified From Email.

Quick Prerequisites

A Postmark account (Free Developer plan available).
A verified sender signature (email or domain).

01 Create a Server

In the Postmark dashboard, navigate to Servers → Create Server. Give your server a name and choose the Transactional stream for your messages.

02 Retrieve Server Token

Inside your server settings, click on API Tokens in the sidebar. Copy the alphanumeric string shown there.

⚠️ Security: Treat your Server Token like a password. If compromised, regenerate it immediately in the API Tokens tab.

03 Verify Sender Signature

Go to Sender Signatures and add the email you wish to send from (e.g., hello@domain.com). Verify it via the confirmation email or DNS.

✅ Use this verified email in your config form

Postmark Pricing (2026)

Plan	Price	Included Emails	Best For
Developer	$0	100 / mo	Testing
Pro	$16.50	10,000 / mo	Startups
Business	$50+	50,000+ / mo	Scaling Apps

🚀 Success Tips

Domain Verification: Verifying your entire domain (DKIM) provides better deliverability than verifying a single email.
Message Streams: Keep your transactional and broadcast emails in separate streams to protect your sender reputation.
Activity Logs: Postmark provides 45 days of detailed logs—use these to troubleshoot delivery issues instantly.