Postmark has a clear focus: getting your application's email, such as password resets and receipts, delivered. It says plainly that it is not a marketing tool. Mailburger is the opposite kind of product: a place to build lists, write newsletters and run automations. This comparison, using public pricing checked in October 2026, is less about which one to pick and more about which emails belong where.
The short answer
Keep Postmark, or another API provider, for app email. Mailburger does not send transactional email. Move newsletters and other marketing to Mailburger if you want a drag-and-drop editor, lists, segments, signup forms and automations, none of which Postmark offers. The two work side by side, each on its own sending domain or subdomain.
The side-by-side tables are on Mailburger vs Postmark.
What each one is
Postmark is a transactional-first email API and SMTP service for developers and product teams, owned by ActiveCampaign since 2022. It has code templates with Mustachio syntax and reusable layouts, webhooks, inbound processing and 45 days of message history on every plan. Broadcast message streams handle bulk app email on separate infrastructure. Postmark says it has no list uploads, no WYSIWYG editor and no campaign reporting, and that your lists stay outside Postmark.
Mailburger is an email marketing tool for newsletters, signup forms and automations, running on its own delivery engine. Every plan includes a drag-and-drop editor, templates, signup forms with double opt-in, segments and campaign reports. Paid plans add automations, A/B tests, contact scoring, AI help and a REST API for syncing contacts and recording events. Plans are priced in euros by subscribed contacts and monthly emails, billed monthly with no contract.
Features side by side
| Feature | Mailburger | Postmark |
|---|---|---|
| Built for | Marketing email and campaigns | App email, with broadcast streams for bulk app email |
| Email editor | Drag-and-drop, all plans | Code templates, no WYSIWYG editor |
| Lists and contacts | Audiences, tags and custom fields | No; lists stay in your app |
| Segments | Fields, tags, audiences, engagement and activity | No |
| Signup forms | Embedded, hosted page, popup, banner, slide-in | No |
| Automations | Grow and up | No |
| Campaign reports | Yes, with click maps | No campaign reporting |
| Transactional API and SMTP | No | All plans |
| Team members | 1 on Free, 3 on Grow, unlimited on Pro | 4 on Basic, 6 on Pro, unlimited on Platform |
| Single sign-on | SAML on Pro, €20 | No |
Pricing at 50,000, 100,000 and 500,000 emails a month
| Emails a month | Mailburger | Postmark Basic | Postmark Pro |
|---|---|---|---|
| 50,000 | €5 (Grow, up to 5,000 contacts) | $55 | $60.50 |
| 100,000 | €20 (Pro, up to 50,000 contacts) | $115 (125,000 tier) | $125.50 (50,000 tier plus overage) |
| 500,000 | €20 (Pro, up to 50,000 contacts) | $455 (700,000 tier) | $500.50 (700,000 tier) |
Monthly list prices. Postmark prices in US dollars only. Platform, aimed at agencies and larger teams, is $66 at 50,000 emails.
As with any API provider, this is not a like-for-like contest: Postmark's price covers app email, which Mailburger does not send. What the table shows is what it costs to run your marketing volume on a tool built for it.
How Postmark bills. You pay for emails processed each month, and that includes more than sent messages: sandbox test messages, processed inbound messages and every CC or BCC address count too. The tiers are 10,000, 50,000, 125,000, 300,000, 700,000 and 1,500,000 emails, so between tiers you either pay overage or buy the next tier up. Overage is billed on the next month's invoice and cannot be capped or switched off; on Basic it is $1.80 per 1,000 up to the 125,000 tier. Unused emails do not roll over. Billing is monthly, by card, in US dollars, with no annual plans.
How Mailburger bills. Plans count subscribed contacts and contacts pending double opt-in, plus a monthly email allowance. Unsubscribed and bounced contacts do not count, and test sends and confirmation emails do not use your allowance. Grow covers 5,000 contacts and 50,000 emails a month for €5, and Pro covers 50,000 contacts and 500,000 emails for €20. If your list is larger than a plan's contacts, choose by contacts first. Every plan is on our pricing page.
Free plans. Postmark's Developer plan gives 100 emails a month, needs no card and does not expire, but it allows no overage and does not include the Bulk Email API. Mailburger's Free plan covers 500 contacts and 2,500 emails a month.
Deliverability and sending
Postmark keeps transactional and broadcast mail on separate IP ranges and vets senders by hand: every new account is reviewed before it can send beyond its own domains, and new customers must ask for broadcast approval. It suppresses hard bounces and spam complaints automatically, supports DKIM, SPF and DMARC, and offers a free weekly DMARC digest or paid DMARC Digests at $14 a month per domain. Dedicated IPs cost $50 a month on Pro and Platform and need at least 300,000 emails a month.
Mailburger sends through its own delivery engine. You verify your sending domain with SPF, DKIM and DMARC records, every campaign carries one-click unsubscribe headers, and signup forms support double opt-in, business-email validation and spam protection with a built-in proof-of-work check or Cloudflare Turnstile. Mailburger does not offer dedicated IPs. Sending marketing from a subdomain such as mail.yourbrand.com keeps its reputation apart from your app email.
Team, security and agencies
Postmark allows 4 users on Basic, 6 on Pro and unlimited users on Platform, with Owner, Admin and Teammate roles set per server and account-wide two-factor enforcement. A Postmark guide says it does not offer single sign-on. Platform is marketed to agencies, with unlimited servers, and you can give each client access to its own server only. Postmark hosts data in the United States and has no EU plans.
Mailburger includes 3 team members on Grow and unlimited members on Pro, along with SAML single sign-on and a workspace audit log. The Agency plan at €49 pools 100,000 contacts and 1,000,000 emails across up to 25 client workspaces, and Agency Plus at €149 pools 500,000 contacts and 5,000,000 emails with unlimited clients. Both are white label, with your own logo, colour, sign-in link and system emails.
Support
Postmark gives every customer the same support, with no priority tier. Email and ticket support is answered on weekdays, and live chat is available during business hours on paid plans. There is no 24/7 support.
Mailburger offers email support on every plan, with priority support on Pro.
Who should choose which
Keep Postmark for:
- password resets, receipts, alerts and other email your app sends to one person,
- inbound email you want parsed into your application,
- 45 days of message history and delivery events for your developers.
Choose Mailburger for:
- newsletters, announcements and promotions to subscribers,
- welcome series and follow-ups built from triggers, waits and branches,
- signup forms with double opt-in, segments and campaign reports,
- teams who want single sign-on, or agencies managing several clients.
If you are already sending broadcasts through Postmark from your own code, Mailburger replaces the list handling, templates and scheduling you built, and Postmark keeps doing what it does well.
Switching your marketing email from Postmark
Export your subscriber list from your own app, using the unsubscribes you collected from Postmark's webhooks to leave out everyone who opted out, and import it into an audience. Rebuild your broadcast templates in the drag-and-drop editor, replacing Mustachio variables with tags such as {{first_name|there}}, and move scheduled sends and follow-ups into campaigns and automations. Verify a sending subdomain and warm it up. The full checklist is on Mailburger vs Postmark.
Prices checked on 13 October 2026 from each vendor's public pricing pages.