transactional-email-and-apis
Postmark
Developer-focused transactional email API with fast delivery, detailed tracking, and 45-day log history.
Postmark is a specialized transactional email delivery service focused on high-speed inbox placement. It runs separate infrastructure for transactional messages and broadcast marketing, protecting password resets and purchase receipts from sender reputation hits. The platform provides detailed bounce classifications, link tracking, email templates, and webhooks. The Developer plan gives developers 100 emails every month free forever with a 45-day message retention window and no credit card required.
Free tier quotas
| Monthly Emails | 100 emails/month free forever |
| Full Message Retention | 45 days of complete message content and activity logs |
| Custom Domains | Up to 10 sending domains with DKIM and SPF checks |
| Message Streams | Up to 30 transactional and broadcast message streams |
| Team Seats | Up to 6 team user accounts |
| Developer Protocols | Full REST API, SMTP relay, and webhooks included |
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👍 Good boy
- +Delivers transactional messages with low latency and high inbox placement rates.
- +Retains 45 days of full message content and metadata on the free plan, beating typical 3-day caps.
- +Isolates transactional and broadcast streams to prevent marketing blasts from hurting critical delivery.
- +Permits up to 10 custom domains and 6 team members on the free Developer plan.
👎 Watch out
- −Free volume is limited to 100 emails per month, designed for development and testing.
- −No intermediate plan exists between the 100 email free tier and the $15/month 10,000 email plan.
- −Inbound email JSON parsing requires upgrading to the Pro plan at $16.50/month.
- −Dedicated IP addresses require sending at least 300,000 emails per month on higher tiers.
The catch
Monthly free volume is capped strictly at 100 emails, with no overages permitted on the free plan.
Free tier value
- Generosity
- A
- Estimated value
- $15/mo
- Feature parity
- Full REST API, SMTP, templates, webhooks, and 45-day message history included
Screenshots
