A catch-all functionality that is activated for a given mailbox will permit you to receive email messages that are sent to addresses that do not actually exist. To put it differently, if you remove an email address and someone still sends a message to it, or to any mistyped email address under the very same domain, you’ll get the email in the catch-all mailbox. Using this feature means that you won’t miss an email for any reason, which could be vital in case you run some company, for example. Since you may start receiving junk emails, you can combine the catch-all functionality with anti-spam filters in order to receive only real messages in your inbox. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be enabled for a catch-all mailbox.