Upcoming changes: Postmark will no longer support API requests over HTTP

To ensure the continued security of our systems, we wanted to let you know about an upcoming change to our API access. In short, we want to ensure Postmark—and your account—is as secure as possible, and we've found that there is a small portion of our traffic that is using HTTP rather than HTTPS.

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What's changing

Starting on November 30th, we will no longer be supporting HTTP connections to our API. That's three months away, but we want to give any affected customers—yourself included—a good bit of time to prepare for this change.

What you need to do

To avoid any disruptions with your email processing, please update any HTTP connections to our API to the secure version (HTTPS). For most scenarios, this is as simple as finding any place in your application/service where you call an API URL for Postmark starting with HTTP. Like this…

http://api.postmarkapp.com/ser...

And change it to this:

https://api.postmarkapp.com/server

That's it. However, if you have any further questions or find a configuration where you aren't sure what to change, reach out to our support team and we'll do everything we can to help out and give you any necessary instructions.

The timeline

We want to make this as easy as possible for all customers, so we'll do the following:

  • Sept. 1st, 2022 (today): Communicate the plan to make these changes (via email and here, on our updates page)

  • Sept 12, 2022: Reminder announcement

  • Sept. 21st, 2022: Reminder announcement

  • Oct. 4th, 2022: Reminder announcement

  • Oct. 13th, 2022: First blackout period. We'll reject access to API endpoints using HTTP for a 60 minute period

  • Oct. 27th, 2022: Second blackout period

  • Nov. 16th, 2022: Third and final blackout period

  • Nov. 27th, 2022: Final reminder announcement

  • Nov. 30, 2022: Final cutover date

We understand these kinds of changes can be inconvenient, but it's a step that benefits everyone. And we appreciate your cooperation on this—thanks so much!