What are the SMTP details / API Tokens I should be using?

  • Server - smtp.postmarkapp.com
  • Ports - 25, 2525, or 587
  • TLS - TLS is available via the STARTTLS SMTP extension. This establishes an encrypted connection to our SMTP server, and all API Tokens and content are encrypted while they are transmitted to us. We recommend you use TLS if possible.
  • Username/Password - Use the Server API token which is found in your Postmark account by going to Server > API Tokens. The Server API token is unique for each Server you create in Postmark.

For more information on using SMTP, please review our developer docs.

If you are using Postfix to send through Postmark you can follow our Instructions for getting set up in our guide Can I configure Postfix to send through Postmark?

Last updated September 19th, 2019

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