Postmark pricing, explained: every plan, overage and real costs
Postmark has three paid plans, all starting at 10,000 emails a month: Basic at $15, Pro at $16.50 and Platform at $18. They step up through 50,000, 125,000, 300,000 and 700,000 emails to 1.5 million, where they cost $775, $852.50 and $930. Extra emails cost $1.15 to $1.80 per 1,000 depending on plan and tier, and newsletters count against the same allowance. A free Developer plan covers 100 emails a month.
We build SendForAI, an email API that runs on Amazon SES at cost, so we're not neutral. Every Postmark number below comes from Postmark's own pricing page, read November 7, 2026, and there's a section on where Postmark is the better choice.
Postmark's plans at every volume
Each plan has the same six volume steps. Prices below are per month; the second figure is what each extra 1,000 emails costs above that step.
| Emails / month | Basic | Pro | Platform |
|---|---|---|---|
| 10,000 | $15 + $1.80/1k | $16.50 + $1.30/1k | $18 + $1.20/1k |
| 50,000 | $55 + $1.80/1k | $60.50 + $1.30/1k | $66 + $1.20/1k |
| 125,000 | $115 + $1.80/1k | $126.50 + $1.30/1k | $138 + $1.20/1k |
| 300,000 | $245 + $1.70/1k | $269.50 + $1.25/1k | $294 + $1.15/1k |
| 700,000 | $455 + $1.70/1k | $500.50 + $1.25/1k | $546 + $1.15/1k |
| 1,500,000 | $775 + $1.70/1k | $852.50 + $1.20/1k | $930 + $1.15/1k |
| Above 3,000,000 | Contact Postmark sales | ||
Source: postmarkapp.com/pricing, from the page's own pricing slider, read November 7, 2026. Overage is billed at the end of the billing cycle; Postmark's own example is 25,000 emails on the 10,000 plan costing $15 + $27 = $42.
What each plan includes
Volume is priced almost the same across plans; the differences are team size, structure and inbound email. Since August 2025 the Pro and Platform features have been available at the 10,000-email step too. Before that, Pro features started at $60.50 a month and Platform at $138, per Postmark's announcement.
| Basic | Pro | Platform | |
|---|---|---|---|
| Users | 4 | 6 | Unlimited |
| Servers | 5 | 10 | Unlimited |
| Message streams | 15 | 30 | Unlimited |
| Sending domains | 5 | 10 | Unlimited |
| Data retention | 45 days | 45 days, up to 365 as an add-on | 45 days, up to 365 as an add-on |
| Inbound email processing | No | Yes | Yes |
| Dedicated IP add-on | No | From $50/mo at 300,000+ emails | From $50/mo at 300,000+ emails |
Add-ons on top: DMARC monitoring from $14 a month per domain, and custom data retention from $5 a month on Pro or Platform. Postmark has no annual plans, and unused emails don't roll over.
Pro is often cheaper than Basic
Basic has the lowest price at each step, but the highest overage: $1.70 to $1.80 per 1,000, against $1.20 to $1.30 on Pro. So for any volume between steps, run the numbers. Across the self-serve range, Pro costs less than Basic at more than half of all volumes, and you get inbound email, more users and more streams with it.
| Emails / month | Basic | Pro | Platform | Cheapest |
|---|---|---|---|---|
| 25,000 | $42 | $36 | $36 | Pro 10k + overage |
| 80,000 | $109 | $99.50 | $102 | Pro 50k + overage |
| 200,000 | $245 | $224 | $228 | Pro 125k + overage |
| 2,000,000 | $1,625 | $1,452.50 | $1,505 | Pro 1.5M + overage |
Each cell is the cheaper of the step that covers the volume and a lower step plus that plan's overage, billed per 1,000 emails. Basic still wins at the step volumes themselves, for example 500,000 emails ($455 on the 700k step).
Newsletters on Postmark
Postmark allows broadcast email through a separate Broadcast message stream, which you ask Postmark to approve before your first send. Broadcast emails need an unsubscribe link, and they count against the same monthly allowance as transactional email, with no extra fee, per Postmark's message streams page. That page also says Postmark doesn't offer list uploads, a visual editor or campaign reporting, so you manage the list yourself.
Here's what transactional email plus a weekly newsletter costs, with Resend (which bills newsletters by contacts) and SendForAI:
| Workload | Emails / month | Postmark | Resend | SendForAI |
|---|---|---|---|---|
| Early SaaS: 10,000 transactional, 2,000 contacts | 18,000 | $26.90 Pro | $60 | $5.88 |
| Growing SaaS: 50,000 transactional, 10,000 contacts | 90,000 | $112.50 Pro | $100 | $13.80 |
| Newsletter-heavy: 100,000 transactional, 25,000 contacts | 200,000 | $224 Pro | $215 | $25.90 |
Newsletter sent to the whole list 4 times a month. Postmark: cheapest of its three plans for the combined volume. Resend: transactional plan plus its contact-based marketing plan. SendForAI: one bill for both.
Postmark vs Resend vs SendForAI
Transactional email only, each provider on its cheapest option for the volume:
| Emails / month | Postmark | Resend | Amazon SES (raw) | SendForAI |
|---|---|---|---|---|
| 10,000 | $15 | $20 | $1.04 | $5 |
| 50,000 | $55 | $20 | $5.19 | $9.40 |
| 100,000 | $115 | $35 | $10.38 | $14.90 |
| 1,000,000 | $775 | $650 | $103.84 | $113.90 |
Resend vs Postmark: Postmark is the cheaper of the two only at the 10,000-email step. From 50,000 emails a month Resend costs less, and the gap grows with volume. Resend also has a free plan that sends to anyone (3,000 a month), where Postmark's free plan is 100 emails. Postmark's case is its focus on transactional email and its tooling. Full Resend numbers: Resend pricing.
Raw Amazon SES is the cheapest, if you build bounce handling, suppression and unsubscribes yourself; see Amazon SES pricing. SendForAI runs on SES with those built in: $0 to build, $5 in months you send (10,000 emails included), then $0.11 per 1,000.
Where Postmark is the better choice
- Transactional deliverability is the whole point. Postmark has long been known for fast, reliable transactional delivery and publishes its delivery times to the major inbox providers on its status page. If inbox speed for password resets matters more than price, that track record is worth paying for.
- You need inbound email. Pro and Platform parse incoming mail and post it to your app. SendForAI doesn't receive email.
- You want mature tooling and a long history. Templates, servers and message streams for organizing environments, team accounts and years of production use. SendForAI is in early access: payments run in test mode and our Amazon SES production access is under review.
Pick Postmark if
- you send mostly transactional email and value its deliverability reputation,
- you need inbound email processing, or
- your volume sits right on one of its steps and you want a mature, hands-off service.
Pick SendForAI if
- price at volume matters: about $114 at a million emails a month against $775 on Postmark,
- you send newsletters too and don't want to manage them inside a transactional tool, or
- an AI agent does the sending and needs to set up, spend and ask for approval through an API.
Comparing other providers? See SendGrid pricing and Mailgun pricing.
Postmark pricing FAQ
How much does Postmark cost?
Postmark has a free Developer plan with 100 emails a month. Paid plans start at 10,000 emails a month: Basic $15, Pro $16.50 and Platform $18. At 1.5 million emails a month they're $775, $852.50 and $930. Extra emails cost $1.15 to $1.80 per 1,000 depending on the plan and tier.
Is Postmark free?
Only for testing. The free Developer plan includes 100 emails a month, never expires, and doesn't allow overage. There's no tier between 100 and 10,000 emails a month.
What's the difference between Postmark Basic, Pro and Platform?
Basic covers up to 4 users, 5 servers, 15 message streams and 5 sending domains. Pro raises that to 6 users, 10 servers, 30 streams and 10 domains and adds inbound email processing. Platform makes users, servers, streams and domains unlimited. Pro and Platform can add longer data retention and dedicated IPs.
Can I send newsletters with Postmark?
Yes, through a separate Broadcast message stream that you request approval for. Broadcast emails need an unsubscribe link and count against the same monthly allowance as transactional email, with no extra fee. Postmark says it doesn't offer list uploads, a visual editor or campaign reporting.
Does Postmark have annual plans?
Not at the moment, per its pricing FAQ. Plans are monthly, unused emails don't roll over, and overage is billed at the end of the cycle.
Is Postmark more expensive than Resend?
At 10,000 emails Postmark ($15) is cheaper than Resend Pro ($20). From 50,000 up Resend is cheaper: $20 against $55 at 50,000 and $650 against $775 at a million.
Sources and method
Postmark plans, steps, overage and add-ons: postmarkapp.com/pricing (the page's own slider data). Billing rules: "How does monthly pricing work?". Broadcasts: message streams. Plan changes: Postmark's August 2025 announcement. All read November 7, 2026. Overage is priced per 1,000 emails. Resend, Amazon SES and SendForAI prices are the same ones used across this site; SES includes message data at 32 KB per email. Prices change; spot an error? hello@sendforai.com.