e-NOTUM allows you to configure warnings in the event that errors occur in the management of notifications. These notices can be via e-mail or via integration.
In the Configuration > Organization section (point 5: Activity e-NOTUM) you can define an email address in the field: Error notification email.
Errors that occur in the notification lifecycle (failed to register or deposit or expire) will be sent to this mailbox, as well as errors in sending state changes to built-in applications (if applicable).
This mailbox is customizable. If no specific address is defined, e-NOTUM defaults to the same address that daily reports are sent to.
Another option is to configure it via integration, also in the same section (under email notifications).