A catch-all email mailbox receives email messages sent to invalid addresses under the same domain name. For example, an email message sent to the misspelled suport@domain.com will be delivered to support@domain.com if the catch-all feature has been enabled for the latter. In this way, you can receive email messages from friends or customers who may have sent a message to your email address with a spelling mistake or to an obsolete one, which they may still have, but you have already deleted. Just one single mailbox per domain can be a catch-all one and email forwarding cannot be enabled for such a mailbox. This is due to the fact that at some point you may start receiving spam messages in the catch-all mailbox and the forwarding limitation means that the spam will not be re-sent to a 3rd-party mailbox.