When the server receives email to addresses that don’t exist, it has to do something with those messages. Your Slamdot account allows you to choose from three options to handle such messages:
To set the option of your choice, click “Domains” from the dashboard. Chooose a domain, hit “Manage”. Click “Spam Settings” and go to the “Catch All” tab. Select the method of handling undeliverable email and save your changes.