Static IP Deprecation: Third blackout period today, August 9th, from 4:00am - 4:00pm ET (12 hours)

Wednesday, 9 August 12 hours

The maintenance is now complete. Thanks for your patience.


The scheduled maintenance is now underway. We'll keep you updated on our progress.


Static IP Deprecation: Postmark will no longer support IP allow-listing for our API In the coming weeks, we’ll be making some changes to Postmark that will result in our API no longer being accessible on a static set of IPs. As such...

  • IP allowlisting for our API will no longer be supported starting August 23, 2023.
  • This change only applies to Postmark’s API and does not affect our SMTP and Webhook IPs.

We’ll retire support for static IPs on August 23, 2023 but we’ll be running a set of blackout periods before that to help you (and us!) catch any issues. Here’s what to expect:

August 9th: Third blackout period From 4.00am-4:00pm ET (12 hours)

See our full announcement here for more details and recommended work arounds if you need to take action.

If you have any questions or need any guidance let us know.

Avatar for Dana Chaby
Dana Chaby
Began at:

Affected components
  • API