What is the default address?
It is a catchall mailbox that receives all emails written to a non-existing name @ your domain.
Why is this disabled?
The Default Address is disabled by default due to the high possibility of it being misconfigured which can result in your default address becoming flooded with spam emails.
How do I enable it?
Please contact Osirion via phone or live chat and ask for your "catchall email to be enabled."
Once enabled, what do I do?
Go through the drop down and make sure every domain's Current Setting is ":fail: No Such User Here".
If the settings are wrong, or you are not sure, follow these steps.
This will prevent your account from filling up with unnoticed spam.