Tool profile
Postmark: cost, fit and limits
Postmark is a transactional email service now run under ActiveCampaign that delivers application email such as receipts, password resets and notifications through an API or SMTP. It separates transactional and bulk traffic into message streams and is aimed at developers who care about delivery speed and clear logs.
What to know first
Postmark prices by monthly email volume with three paid tiers that differ mainly in overage rate, limits and add-ons, not in core delivery. The free plan is a 100 email trial rather than a working tier, and nothing sits between 100 and 10,000 emails. Dedicated IPs, longer activity retention and DMARC monitoring are paid extras. Its only AI item on the pricing page is a package that teaches coding agents to send email.
Postmark at a glance
| Maker | ActiveCampaign (Postmark), United States |
|---|---|
| Free plan | Yes |
| Entry price | $15 per month for 10,000 emails |
| API access | Yes |
| Category | Best AI Email Deliverability Tools in 2026, rank 2 of 11 |
| Website | postmarkapp.com |
Who Postmark is best for
Developers who want separate mail streams
Postmark lets one account run several transactional streams plus a bulk stream, so receipts and newsletters do not share reputation. Free and Pro allow up to 30 transactional streams.
Bootstrapped startups
The pricing page offers a $75 credit to launched, paying, unfunded companies who contact support, which softens the jump from the 100 email free plan to the 10,000 email entry tier.
Agencies managing client domains
Platform has unlimited custom sending domains, servers and users, while Basic caps at five domains and four users, so the tier maps to how many clients you host.
Postmark plans and pricing
| Plan | Price | What it includes |
|---|---|---|
| Free | $0 | 100 emails a month with no overages allowed, six users and up to ten servers. It is meant for evaluation and low-volume testing. |
| Basic | From $15 a month for 10,000 emails | Extra emails at $1.80 per 1,000, five custom domains, four users and five servers. Entry tier for small production apps that need a few domains. |
| Pro | From $16.50 a month for 10,000 emails | Extra emails at $1.30 per 1,000, ten domains, six users, and access to dedicated IPs and custom retention. |
| Platform | From $18 a month for 10,000 emails | Extra emails at $1.20 per 1,000, with unlimited domains, users, servers and message streams. Highest overage discount among the three paid tiers on the page. |
| Add-ons | From $5 to $50 a month | Custom retention from $5, DMARC monitoring from $14 per domain, and dedicated IPs from $50 per IP for 300,000 or more emails a month. |
Checked November 2026.
What Postmark does
- Message streams
- Transactional, broadcast and inbound traffic run in separate streams within a server. Stream limits differ by plan, with Platform unlimited, which keeps different mail types from sharing one sending reputation.
- Inbound processing
- Incoming mail is converted to JSON and posted to a webhook URL, so replies to a transactional address can feed a support or ticketing system without parsing raw messages.
- Activity retention
- Full message content is kept for 45 days by default and can be set between 7 and 365 days on higher tiers. Delivery statistics are kept indefinitely, per the pricing page.
- Status page statistics
- Postmark publishes delivery statistics to major inbox providers on its status page, which lets a buyer review claimed speed instead of relying on the headline claim of being faster than other providers.
- DMARC monitoring
- A paid add-on from $14 per domain reports on authentication results, which helps spot spoofing or a forgotten sending source before it hurts delivery. The page prices it per domain, so cost grows with each sending domain you add.
How Postmark handles your data
Postmark's pricing page states SOC 2 and GDPR compliance, penetration testing, DDoS protection, two-factor authentication, user roles and API permission controls. It says statistics are kept indefinitely while message content follows the retention setting, 45 days by default and adjustable from 7 to 365 days. The pricing page names Chicago, Illinois as headquarters. Postmark's privacy policy URL redirects to ActiveCampaign's, which was not opened, so its hosting regions, sub-processors and statements on AI training were not checked for this page.
Where Postmark falls short in practice
- No tier between 100 and 10,000. The free plan stops at 100 emails a month and the first paid tier starts at 10,000. A small app sending a few hundred messages pays the full entry price.
- Monthly billing only. The pricing page says annual plans are not offered yet, and PayPal and purchase orders are not accepted. Finance teams that pay by invoice or want a yearly discount will find this limiting.
- Built for application mail. Postmark focuses on transactional delivery with bulk as a secondary stream. It lists no warmup service or inbox placement tests, so cold outreach and campaign testing need separate tools.
Works with
Alternatives to Postmark
Postmark: common questions
What does Postmark charge when I go over my email allowance?
As of November 2026 the pricing page lists overage of $1.80 per 1,000 emails on Basic, $1.30 on Pro and $1.20 on Platform. Unused emails do not roll over to the next month. The free plan allows no overages at all, so sending stops at 100.
When does a dedicated IP make sense on Postmark?
Postmark lists dedicated IPs from $50 a month per IP, for senders at 300,000 emails a month or more, on Pro or higher. Below that volume the page points to its vetted shared IPs, which spreads reputation across many senders.
Does Postmark keep the content of my emails?
Full message content is retained for 45 days by default, and Pro or higher can set it from 7 to 365 days for an extra fee starting at $5 a month. Statistics are kept indefinitely. The page does not describe what happens to content after the window ends.
Can Postmark send marketing newsletters?
The pricing page describes a Bulk Email API and broadcast-style streams alongside transactional ones, so bulk sending is supported on a separate stream. It lists no campaign editor or audience tools of the kind in newsletter products, so list management stays on your side.
Is there a trial for Postmark?
The Free plan gives 100 emails a month without a time limit, which serves as a trial. There is no mid-sized free tier. Bootstrapped, launched companies with paying customers and no outside investment can ask support for a $75 credit, according to the pricing page.