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Connect Postmark

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TL;DR
  • Host smtp.postmarkapp.com, port 587 (STARTTLS).
  • Use your Server API token as both the username and the password.
  • Emails go to Postmark's default transactional stream.
Setting Value
Host smtp.postmarkapp.com
Port 587 (leave Use secure (TLS/SSL) off, STARTTLS is used). 2525 also works
Username Your Server API token
Password The same Server API token

Use the Server API token, not the Account API token.

Before you send

Section titled “Before you send”
  • Turn on SMTP for the server in Postmark’s server settings.
  • Add a sender signature or verify your domain (DKIM and Return-Path).

Messages without a stream header use the default transactional stream (outbound), which is what FlowSend emails should use. Source: Postmark’s SMTP guide.