A catch-all feature that is activated for a particular email mailbox will permit you to receive emails that are sent to email addresses that do not actually exist. Otherwise put, if you delete an email address and someone still sends an email to it, or to any mistyped email address under the very same domain name, you will receive the email in the catch-all mailbox. Using this feature implies that you will no longer miss an email for any reason whatsoever, which could be crucial in case you run a company, for example. Since you may start receiving unsolicited bulk messages, you can use the catch-all option with anti-spam filtering software in order to receive only real email messages in your inbox. Only one single mailbox per domain can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.