A catch-all functionality that is enabled for a particular e-mailbox will permit you to receive email messages that are sent to addresses that do not really exist. Otherwise stated, if you deactivate an email address and somebody still sends an email to it, or to any misspelled email address under the same domain name, you will get the message in the catch-all mailbox. Using this functionality means that you won’t miss an email for any reason, which could be essential if you run some business, for instance. Since you may begin receiving unsolicited messages, you can combine the catch-all functionality with email filters in order to receive only real messages in your inbox. Just one single mailbox per domain can be a catch-all one and email forwarding cannot be enabled for a catch-all mailbox.