Great deliverability without upgrading to dedicated IP. Some providers say it can’t be done. We disagree.

What does a CORS error mean?

A CORS error suggests that you're running your API call to Postmark on the client-side. To prevent you from leaking your API token, Postmark does not allow that. There would need to be a server-side component that calls and sends the message through Postmark.

Last updated June 11th, 2020

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