Postmark

Email Marketing from $15/mo (25,000 emails)

About Postmark

Postmark is the transactional email service that developers trust for mission-critical messages: password resets, order confirmations, and receipts arrive in under a second, with a 100% uptime SLA.

What it does

Postmark handles the delivery of transactional emails (not marketing blasts) via a simple API or SMTP. It provides real-time delivery analytics, spam complaint tracking, and automatic bounce handling. The service is optimized for speed and reliability, with dedicated IPs and a reputation management system.

Best for

Developers building apps that send time-sensitive transactional emails
SaaS companies needing reliable password reset and notification delivery
E-commerce stores sending order confirmations and shipping updates

Strengths

Sub-second delivery times for most emails
100% uptime SLA with guaranteed delivery
Automatic bounce and complaint handling to protect sender reputation
Detailed delivery logs and real-time analytics

Key features

API & SMTP — Send transactional emails via REST API or SMTP with libraries for Ruby, Python, PHP, Node.js, and more.
Delivery Analytics — Real-time dashboard showing sent, delivered, bounced, and spam-complaint rates per message.
Bounce Handling — Automatic suppression of hard bounces and spam complaints; detailed bounce reasons provided.
Dedicated IPs — Option for dedicated sending IPs to maintain full control over reputation.
Message Streams — Separate transactional and broadcast streams to keep delivery reputation clean.
Webhooks — Real-time event notifications for delivery, bounce, open, and click events.

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