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What is Postmark?
Postmark is a robust transactional email service designed to ensure fast and dependable email delivery for mission-critical communications. Serving businesses ranging from solo developers to large enterprises, it provides an intuitive platform for sending transactional, broadcast, and inbound emails via a secure API or SMTP service. Users benefit from detailed analytics, responsive templates, strong deliverability controls, and customizable retention periods.
The platform separates transactional and promotional messages through distinct sending infrastructures, optimizing inbox placement rates. With comprehensive documentation, customer support, and integration libraries for most programming languages, Postmark enables teams to manage email flows efficiently and scale with confidence.
Features
- Email API: Seamlessly send emails via REST API with libraries for multiple languages
- SMTP Service: Simple SMTP relay for easy integration
- Message Streams: Separate transactional and promotional message delivery infrastructures
- Transactional Email: Fast, reliable delivery for important notifications and password resets
- Inbound Email: Converts inbound emails to JSON and posts to a webhook URL
- Email Templates: Responsive HTML templates for transactional emails
- Analytics & Retention: Delivery, bounce, open, spam rates, and up to 45 days of message retention by default
- Webhooks: Real-time event notifications for email activity
- Custom Sending Domains: Support for custom domain signatures
- Security: Strong authentication and suppression management features
Use Cases
- Delivering password reset, account confirmation, and notification emails to users
- Managing automated application email flows for SaaS and web platforms
- Processing inbound support or contact form submissions via email
- Tracking email engagement, deliverability, and analytics for transactional senders
- Ensuring reliable delivery for high-volume broadcast email campaigns
- Integrating transactional email sending into custom web or mobile applications
- Maintaining compliance with email deliverability best practices for agencies and enterprises
FAQs
-
Do you offer a free trial?
All new accounts start with a free developer plan providing 100 emails per month that never expires. -
Do you offer dedicated IPs?
Dedicated IPs are available for high-volume senders on Pro plans or higher, starting at $50/month per IP. -
Can I send both transactional and marketing emails through Postmark?
Yes, but to maintain high deliverability, transactional and marketing emails are routed through separate message streams. -
What happens if I exceed my plan’s monthly email limit?
Extra emails are billed at a per-thousand rate according to your plan, calculated at the end of your billing cycle. -
Do unused emails roll over to the next month?
No, unused emails do not carry over to the next billing period.
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