A catch-all functionality that is activated for a certain mailbox will allow you to receive email messages that are sent to email addresses that do not really exist. Otherwise said, if you remove an email address and someone still sends an email message to it, or to any mistyped address under the very same domain name, you will get the email in the catch-all mailbox. Using this functionality implies that you won’t miss an email for any reason, which could be crucial if you run a business, for example. Since you may start receiving unsolicited bulk email messages, you can combine the catch-all functionality with email filters in order to get only real messages in your inbox. Just one mailbox per domain can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.