We migrated to a different DNS provider to solve this issue for now so everything is back to normal & we're continuing to monitor. Also, the hosts entries aren't needed anymore so if you made any changes, they can be reverted.

SMTP and Inbound messages are slightly delayed but we're working through those queues now.

The issue stemming from an attack on our DNS provider has returned causing lookups to fail. As an emergency, use a host entry for api.postmarkapp.com to 50.31.156.109 and for SMTP, use "147.75.195.176 smtp.postmarkapp.com"

Everything has been fully resolved and running smoothly again. Thanks for your patience.

DNS seems to be up again, we're continuing to monitor. The hosts entry isn't needed anymore.

If you are using SMTP, use "147.75.195.176 smtp.postmarkapp.com " in a hosts entry on your servers for now.

An attack on our DNS provider is causing lookups to fail. As an emergency, use a host entry for api.postmarkapp.com to 50.31.156.109.