What does a Hard Bounce mean?
If you see a Hard Bounce for a recipient in your activity, that means the message sent to them bounced due to the address being deemed permanently invalid. If you expand the bounce information using the More Details button, you can get a bit more insight into why the address was deemed bad.
5.1.2 (bad destination system: no such domain)
Using these details you can get a clearer picture of what is wrong with the address. In this particular example, the domain was bad and does not exist or has no MX record set up for it.
How do I fix it?
To resolve the bounce, you would first want to determine if the address is actually valid or if it was bad due to a simple typo. You can review the address for accuracy and if it looks correct, try contacting the recipient through another channel and letting them know their address is bouncing. If you provide them with the bounce details, they can ask their mail provider's support team or IT department to investigate why their address is bouncing and resolve the cause of the bounce.
Once the issue is resolved on the receiving end, you can then reactivate the address using the
Reactivate button in the Postmark UI. Once reactivated, you are all set to send to that recipient again and if they resolved the cause of the bounce, you will then get a successful
Delivered event in Postmark instead of another bounce.