About
Postmark is an email delivery service that exposes both an Email API and SMTP service for sending transactional and broadcast email. The platform also includes inbound email processing, message streams, templates, webhooks, analytics, and official SDKs for common languages and frameworks.
The free developer tier includes 100 emails per month and never expires. It is intended for integration testing, deliverability evaluation, and low-volume side projects, while paid plans add higher monthly sending limits, more domains, longer retention, and inbound processing.
- 100 emails per month free
- REST API and SMTP sending
- Inbound email to JSON webhooks
- Official SDKs and libraries
- 45-day message retention on paid plans
- Separate message streams for mail types
Free Tier Value
This free tier is a capped monthly plan with 100 emails included, and it never expires, so its value comes from ongoing access rather than a short trial. At the cheapest paid rate shown ($1.80 per 1,000 extra emails on Basic), 100 emails is worth about $0.18/month in send volume, and the no-overages rule keeps the value conservative; no credit card is required to start.
What's included in the free tier
- 100 emails per month.
- No overages allowed on the free plan.
- Free developer tier never expires or runs out.
See Postmark pricing for current limits.
Paid plans
Basic
- starting emails/month
- 10,000
- extra emails
- $1.80 / 1,000
- custom sending domains
- 5
- data retention
- 45 days
- Industry-leading deliverability rates & speed
- 45-day data retention
- 5 custom sending domains
- Unlimited emails/day
- Detailed analytics and insights
Pro
- starting emails/month
- 10,000
- extra emails
- $1.30 / 1,000
- custom sending domains
- 10
- data retention
- up to 365 days
- inbound email processing
- included
- Industry-leading deliverability rates & speed
- Customizable data retention up to 365 days
- 10 custom sending domains
- Unlimited emails/day
- Detailed analytics and insights
- Inbound email processing
Platform
- starting emails/month
- 10,000
- extra emails
- $1.20 / 1,000
- custom sending domains
- unlimited
- data retention
- up to 365 days
- inbound email processing
- included
- Industry-leading deliverability rates & speed
- Customizable data retention up to 365 days
- Unlimited custom sending domains
- Unlimited emails/day
- Detailed analytics and insights
- Inbound email processing
Pricing extracted from Postmark's pricing page. Always verify current pricing before committing.
