A catch-all functionality that is activated for a specific email mailbox will permit you to receive email messages that are sent to addresses that do not really exist. Otherwise stated, if you remove an email address and someone still sends an email message to it, or to any mistyped email address under the very same domain, you will receive the email in the catch-all mailbox. Using this functionality means that you won’t miss an email for any reason whatsoever, which could be essential if you run a business, for example. Since you may begin receiving unsolicited messages, you can use the catch-all functionality with anti-spam filtering software so as to receive only real emails 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.