A catch-all functionality that is enabled for a specific email mailbox will permit you to receive emails that are sent to addresses that do not actually exist. Otherwise stated, if you delete an email address and someone still sends an email message to it, or to any miswritten email address under the exact same domain, 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 vital if you are running a business, for instance. Since you may start receiving unsolicited bulk email messages, you can combine the catch-all option with anti-spam filters so as to receive only legitimate messages in your inbox. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.