A catch-all functionality that is enabled for a given email mailbox will permit you to receive email messages that are sent to email addresses that do not really exist. Otherwise stated, if you delete an email address and somebody still sends an email to it, or to any miswritten email address under the same domain name, you will receive the email in the catch-all mailbox. Using this functionality implies that you won’t miss an email for any reason whatsoever, which could be crucial in case you run some business, for example. Since you may begin receiving unsolicited messages, you can combine the catch-all functionality with email filters in order to get only real messages in your inbox. Only one single mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.