Webhook email alerts are triggered whenever there is an HTTP return code 4XX or 5XX, signifying a temporary or permanent rejection from the endpoint server.
To activate the alerts navigate to your Mailparser Inbox, under Settings > Alerts. You can select from here "When a webhook fails > Yes" to activate the alerts.
You may send webhook alerts to multiple email addresses if you like, simply use a semicolon as a delimiter after each different email address: