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Postmark

What is Postmark? Postmark is an email delivery service focused on application and transactional email, with API and SMTP delivery. Read more on the official website and in the official documentation. Profile The Postmark profile supports API and SMTP. Each route uses its own server token. Create the connection Before you begin, create an account […]

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Overview
Contents
On this page
  1. What is Postmark?
  2. Profile
  3. Create the connection
  4. Verify delivery
  5. Webhooks
  6. Troubleshooting

What is Postmark?#

Postmark is an email delivery service focused on application and transactional email, with API and SMTP delivery. Read more on the official website and in the official documentation.

Profile#

The Postmark profile supports API and SMTP. Each route uses its own server token.

  • API: postmark+api is the default and requires a Postmark server token (secret).
  • SMTP: postmark+smtp requires a separate Postmark SMTP server token (secret).
  • Webhook setup is separate from the send transport.

Create the connection#

Before you begin, create an account and prepare the credentials for the selected transport. Complete any sender or domain verification required by the provider.

  1. In WordPress admin, open Jooosi Mail → Connections and choose New connection.
  2. Enter a descriptive Connection name and select Postmark in Profile.
  3. Choose postmark+api or postmark+smtp and enter the matching token. Do not put a server token in the SMTP field or an SMTP server token in the API field.
  4. Review the sender, routing, and advanced settings for this connection.
  5. Choose Create connection to save it.

For the shared connection workflow, see Provider profiles and transports.

Verify delivery#

Follow Send a test email and send it to a mailbox you can check. A test sends a real email. Check the mailbox and Jooosi Mail → Logs for the attempt status. See Email logs and resending for details.

Webhooks#

The adapter recognizes delivery, bounce, spam complaint, open, click, and subscription change events. It verifies requests against a built-in IP allowlist and does not use the connection’s Webhook secret for Postmark verification. See Provider webhooks for the endpoint. A proxy that changes the client address can affect verification.

Troubleshooting#

  • For missing-field validation, confirm the scheme and fill the matching token field listed in Profile.
  • For send failures, confirm you used the token for the selected transport; the API and SMTP server tokens are separate.
  • If Postmark webhook calls do not appear, check that requests reach WordPress with the provider client address visible to the application; the adapter rejects unlisted remote addresses.