What is the issue?
Error Message:
Reason: !onp.email.notificationDocDelivery.deliveryFailed.code.498!
Error Screenshot
Cause:
The error is always DNS-specific. For this example, the domain gmbh.salzburg.at does not have any MX records assigned; it's a non-existent domain. When a domain lacks MX records, email servers do not know where to send emails to for that domain.
Check this:
How to check the MX Record?
You can check the MX record online using website: https://mxtoolbox.com/
MX Loop-up result will be like:
Resolution:
What should the document sender do for Error code:498