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Postmark sends your emails through its API. When an email bounces or someone marks it as spam, Postmark tells subscriber.dev, and that person stops getting emails.

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Connect

You need a Postmark server API token, from your server’s API Tokens tab, and a sender signature or verified domain for your from address. Or ask your agent: “Connect Postmark, sending from hello@acme.com.”
You get back a webhook URL to set up next.

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Settings

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Bounces and spam complaints

  1. Run subscriber integrations get postmark to see the webhook URL.
  2. In Postmark, open your server, then the message stream’s Webhooks tab. Add a webhook with that URL and tick Bounce and Spam complaint.
The URL contains a secret token, so keep it private. Postmark doesn’t sign its webhooks, so the token is what proves a request came from your Postmark account. Emails send without the webhook, but bounces and complaints aren’t picked up. When Postmark stops delivering to an address, after a hard bounce or a spam complaint, that subscriber is opted out. Temporary bounces, like a full inbox, are recorded on the run but don’t opt anyone out.