Short answer
As of October 2026, Postmark has a free developer plan (100 emails a month) and three paid plans priced by volume tier: Basic from $15/month for 10,000 emails, Pro from $16.50 and Platform from $18. Tiers step up at 50,000, 125,000, 300,000, 700,000 and 1.5 million, and overage is $1.80 per 1,000 on Basic, $1.30 on Pro and $1.20 on Platform at the smaller tiers.
On Basic, the cheapest plan, that's $15 at 10,000 emails a month, $55 at 50,000, $115 at 100,000 (the 125k tier) and $775 at 1 million (the 1.5M tier). Groundmail is $20, $20, $35 and $650 at the same volumes.
On this page
Postmark plans and tiers
| Monthly emails | Basic | Pro | Platform |
|---|---|---|---|
| 10,000 | $15 | $16.50 | $18 |
| 50,000 | $55 | $60.50 | $66 |
| 125,000 | $115 | $126.50 | $138 |
| 300,000 | $245 | $269.50 | $294 |
| 700,000 | $455 | $500.50 | $546 |
| 1,500,000 | $775 | $852.50 | $930 |
| Overage per 1,000 | $1.80 (up to 125k), $1.70 (300k+) | $1.30 (up to 125k), $1.25 (300k to 700k), $1.20 (1.5M) | $1.20 (up to 125k), $1.15 (300k+) |
As of October 2026, from the volume slider on Postmark's pricing page. Monthly billing, USD. Above 1.5 million Postmark asks you to contact sales. The free developer plan is 100 emails a month.
Last checked on each vendor's public page.
The plans differ in features: Basic allows 5 domains and 4 users, Pro 10 domains and 6 users, Platform unlimited domains and users. Pro and Platform can add custom message retention and dedicated IPs.
What Postmark costs at 10k, 50k, 100k and 1M emails
| Monthly volume | Postmark | Groundmail |
|---|---|---|
| 10,000 emails/month | $15 (Basic 10k) | $20 (Pro, 50,000 included) |
| 50,000 emails/month | $55 (Basic 50k) | $20 (Pro) |
| 100,000 emails/month | $115 (Basic 125k) | $35 (Pro) |
| 1,000,000 emails/month | $775 (Basic 1.5M) | $650 (Scale) |
USD per month, monthly billing, cheapest published plan that covers each volume. Postmark figures use Basic, its cheapest plan at each tier; Pro and Platform cost more. Postmark prices as of October 2026 from postmarkapp.com/pricing. Groundmail prices from our pricing page.
Last checked on each vendor's public page.
At 10,000 a month Postmark Basic is $5 cheaper than our smallest paid plan. From 50,000 up, Groundmail's list price is lower at each volume in the table.
What's included and what costs extra
| Postmark | Groundmail | |
|---|---|---|
| Free option | Developer plan: 100 emails/month | Free plan: 3,000 emails/month (100/day), no end date; card on file to send, not charged |
| Dedicated IPs | From $50/month per IP, for 300,000+ emails a month, on Pro or Platform | $50/mo per IP on Scale (100,000+ emails/month); first IP included from 500,000 |
| Dedicated server | Not listed on the pricing page | Dedicated plan from $299/month: your own mail server and IPs, 250,000 emails included, $0.80 per 1,000 after |
| Message retention | 45 days by default; custom retention up to 365 days from $5/month on Pro and Platform | No fixed figure published; signed webhooks let you keep every event in your own store |
| Support | See their pricing page; support tiers aren't broken out by plan | Email support on every plan, from the team that runs the mail servers |
| Overage | $1.15 to $1.80 per 1,000 depending on plan and tier | Published: $0.90 per 1,000 on Pro, $0.46 to $0.90 on Scale |
Postmark details as of October 2026 from its pricing page.
Last checked on each vendor's public page.
Groundmail has a Free plan (3,000 emails a month), Pro at $20 for 50,000 or $35 for 100,000, and Scale from $90 for 100,000 up to $1,150 for 2,500,000, with overage from $0.90 down to $0.46 per 1,000. Every sending feature is on every plan.
When Postmark is the right choice
- You send about 10,000 emails a month. Basic at $15 is cheaper than our $20 Pro plan.
- You need long message history in the provider's dashboard. Postmark keeps 45 days by default and sells retention up to 365 days.
- You want separate message streams for transactional and broadcast mail in one account.
- You value a long track record. Postmark has been sending transactional email for many years and its docs and community answers are extensive.
Groundmail tends to fit from 50,000 emails a month on price, or when you want a dedicated IP below 300,000 a month or a dedicated mail server. The full side-by-side is in Groundmail vs Postmark.
Switching from Postmark
Moving from Postmark means a Bearer key instead of the X-Postmark-Server-Token header, POST /emails instead of POST /email, and lowercase field names (HtmlBody becomes html). The Groundmail importer can bring suppressions, templates, domains and webhooks across from a Postmark server token, and the Postmark migration docs have the field mapping.
Frequently asked questions
How much does Postmark cost?
As of October 2026, Basic is $15 for 10,000 emails a month, $55 for 50,000, $115 for 125,000, $245 for 300,000, $455 for 700,000 and $775 for 1.5 million. Pro and Platform cost about 10% and 20% more per tier.
Does Postmark have a free plan?
Yes, a developer plan with 100 emails a month. Groundmail's Free plan is 3,000 emails a month (100 a day).
How much is a Postmark dedicated IP?
From $50 a month per IP, for senders of 300,000 or more emails a month on Pro or Platform, per its pricing page. Groundmail's are $50 a month on Scale from 100,000 emails a month, with the first included from 500,000.
How long does Postmark keep messages?
45 days by default, with custom retention up to 365 days as an add-on from $5 a month on Pro and Platform.
Is Groundmail cheaper than Postmark?
From 50,000 emails a month, at list price: $20 vs $55 at 50,000, $35 vs $115 at 100,000 and $650 vs $775 at 1 million, against Postmark Basic. At 10,000 a month Postmark Basic ($15) is cheaper.
Sources
Facts on this page about other companies' products, prices and policies come from these public pages. They change, so check them before you decide.