Postmark

Transactional email service built for application mail delivery. Replaces SMTP with a scalable delivery infrastructure, REST API, and SMTP gateway so developers can send password resets, order confirmations, and notifications without worrying about inbox placement or bounce handling.

Trusted since 2010 by companies such as IKEA, Asana, 1Password, Webflow, and Moz. Postmark differentiates through deliverability focus: it vets senders, separates transactional and promotional streams so newsletters never affect critical emails, and maintains strong relationships with inbox providers without requiring dedicated IPs. 86% customer happiness rating.

Key capabilities:

• REST API and SMTP for sending, with official libraries for Node.js, Ruby, .NET, PHP, Java, and Rails
• Message Streams separating transactional and broadcast emails for better deliverability
• Inbound email processing with parsing, webhooks, and routing rules
• Templates API, bounce management, and open or click tracking
• Webhooks for delivery, bounce, spam complaint, and inbound events

Serves developers building password reset flows, order notifications, and user-action alerts. Teams migrating from SendGrid or Mailgun often choose it for faster delivery and simpler setup. Integrates with frameworks like Laravel and Rails via drop-in gems, supports Better Auth, and offers a CLI plus MCP server for AI-assisted workflows.