# Mimeo and Postmark

Send Mimeo newsletters, sequences and flows through your own Postmark account: streams, webhooks and suppression sync, and what Postmark costs at your volume.

**The short version:** Mimeo runs your list, flows and broadcasts; your own Postmark account delivers the email. Mimeo routes every send to the right Postmark message stream, checks the sender before it sends, and keeps bounces, complaints and suppressions in step with Postmark.

## What Mimeo does with Postmark

- **Routes every send to the right stream.** Broadcasts, sequences, flows and test sends go to your Broadcasts-type stream; password resets and operator alerts go to the transactional `outbound` stream. Nothing to choose per send.
- **Checks the sender before it sends.** Mimeo reads your verified domains and sender signatures from Postmark, and an email from an unverified sender holds in the queue instead of bouncing off Postmark.
- **Keeps suppressions in step.** Postmark's webhooks bring deliveries, bounces, complaints and subscription changes back to your Mimeo, and Mimeo checks its suppression list before every send.
- **Adds one-click unsubscribe.** Mimeo sets the [List-Unsubscribe](https://mimeohq.com/glossary/list-unsubscribe) headers on every broadcast and sequence send. Postmark's broadcast streams swap in Postmark's own unsubscribe link and headers until you ask Postmark support for custom unsubscribe handling; either way, an unsubscribe comes back by webhook and suppresses the person.

## Setting it up

1. In Postmark, confirm a sender signature or verify a DKIM domain, and check your server has a Broadcasts-type stream. Every server starts with one called `broadcast`.
2. In Mimeo, open **Settings → Provider** and choose Postmark. Paste the server token, the account token, the broadcast stream ID and a webhook secret, then **Save & connect**.
3. Press **Verify connection**. It checks the tokens and the stream, and reads back the domains and signatures Postmark has verified.
4. Connect your sending domain under **Settings → Domains & senders** with one CNAME record.
5. Add the webhook URL Mimeo shows to your broadcast stream in Postmark.

The full reference is [Postmark setup](https://mimeohq.com/docs/providers/postmark). A step-by-step walk-through with screenshots is in [send newsletters and automations through Postmark](https://mimeohq.com/guides/send-newsletters-and-automations-through-postmark).

## What Postmark costs

Postmark bills by emails sent a month. On its pricing page on November 9, 2026, the Basic plan started at $15 a month for 10,000 emails, with $1.80 for each extra 1,000. Pro started at $16.50 plus $1.30 per extra 1,000, and Platform at $18 plus $1.20. Check [Postmark's pricing](https://postmarkapp.com/pricing) for your volume; the [email platform cost calculator](https://mimeohq.com/tools/email-platform-cost-calculator) puts it beside a typical email platform at your list size.

## Questions

### Do I pay Postmark or Mimeo for sending?

Postmark. Your Postmark account bills you for the email you send; the Mimeo license is a flat $499 once for your installation, with a year of support & updates.

### Can I switch from Postmark to Resend later?

Yes. Credentials live in your Mimeo's database, not in a config file, so switching providers is a change under Settings → Provider, not a deploy.

### Can a new Postmark account send to my list straight away?

Not until Postmark approves the account. Until then it delivers only to addresses on the sender's own domain.

## Sources

1. [Postmark setup](https://mimeohq.com/docs/providers/postmark), checked 2026-11-09
2. [Pricing](https://postmarkapp.com/pricing), checked 2026-11-10
3. [Message streams](https://postmarkapp.com/message-streams), checked 2026-11-09

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This is the Markdown copy of https://mimeohq.com/integrations/postmark.