Postmark review

Postmark sends transactional and promotional email through an API or SMTP service. Typical transactional messages include password resets and notifications; it can also send promotional messages such as newsletters. Its main distinction is that promotional and transactional email use separate sending infrastructure, so the two message types are not routed through the same stream.

The product also includes email templates, inbound email processing and delivery analytics. The API has libraries for many programming languages, according to the published product information. That makes Postmark a focused delivery service, rather than just an SMTP relay: developers can send messages, manage templates and review delivery in one product.

The pricing page lists a permanent free plan for testing, evaluation and side projects, capped at 100 emails per month. Paid plans start at $15 per month for 10,000 emails. Prices are monthly; annual billing is not offered.

Postmark puts the separation of transactional and promotional email at the center of its product. That is useful for teams that want password resets and receipts handled separately from newsletters, rather than treating every message as the same kind of send. API and SMTP options also give teams more than one way to connect their sending workflow.

The listed paid plans are easy to compare at the starting volume: Basic is $15 per month, Pro is $16.50 and Platform is $18, each including 10,000 emails per month. Basic allows five custom sending domains; Pro allows 10; Platform lists unlimited custom sending domains. Pro and Platform include inbound email processing, which Basic does not list. All three paid plans allow unlimited emails per day, according to the pricing page.

Some Reddit users describe choosing Postmark specifically for transactional email. One commenter says their team used it across client websites for several years without deliverability issues; another says they would stick with Postmark when transactional email is the main need. Those are individual reports, not a guarantee of delivery performance.

The free plan is narrow: 100 emails per month, with no overages allowed. It does not expire, but it is better suited to evaluation or a small side project than ongoing production sending. Paid plans start at 10,000 emails per month, and extra volume costs $1.80 per 1,000 on Basic, $1.30 on Pro or $1.20 on Platform. There is no annual billing discount listed.

Domain and retention limits may push teams above Basic. It includes five custom sending domains and 45-day data retention. Pro raises the domain cap to 10 and allows retention to be customized up to 365 days; Platform has unlimited custom sending domains. Custom activity retention starts at $5 per month. Dedicated IPs start at $50 per month per IP, and are available on Pro or higher only for customers sending at least 300,000 emails per month. DMARC monitoring starts at $14 per month per domain.

Agencies should check account costs before moving clients over. One Reddit thread reports a steep price increase for an account with many servers, but the listed pricing page does not explain server-based billing.

Postmark’s listed plans are monthly, with no annual billing. The free plan allows 100 emails a month and has no overages; it does not expire. Paid plans start at $15/month for Basic, which includes 10,000 emails, five custom sending domains and 45-day data retention. Pro is $16.50/month for the same email allowance, but includes 10 domains, inbound email processing and customizable retention. Platform costs $18/month and adds unlimited custom sending domains. That’s a $3 jump from Basic to Platform before add-ons, though the included domain limits differ substantially.

Extra email costs $1.80 per 1,000 on Basic, $1.30 on Pro and $1.20 on Platform. Dedicated IPs start at $50/month per IP and require Pro or higher plus at least 300,000 emails/month. Custom retention starts at $5/month; DMARC monitoring starts at $14/month per domain. High-volume pricing is custom, not published.

Plan for engineering work if your application sends through Postmark’s API or SMTP service: switching providers means reviewing the sending integration and updating the parts that depend on it. Also inventory templates, inbound email handling and analytics needs, since Postmark lists each as part of its product. The published information does not explain migration tooling, data export, or whether templates and historical analytics can be moved, so confirm those points before committing.

Postmark separates promotional and transactional traffic into Message Streams. If that separation matters to your setup, check how the destination provider handles it before switching; the published material does not document an equivalent migration path. Reddit posts or comments about why users leave Postmark were not included in our published material, so we can’t responsibly report a Reddit-based reason. In practical terms, verify export options, retention needs and the cost of replacing any inbound-email workflow before you move.