A catch-all functionality that is activated for a given email mailbox will allow you to receive emails that are sent to email addresses that do not actually exist. Otherwise put, if you remove an email address and somebody still sends an email to it, or to any misspelled email address under the very same domain, you’ll get the message 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 are running some business, for example. Since you may begin receiving unsolicited bulk email messages, you can use the catch-all feature with anti-spam filters in order to get only legitimate emails in your inbox. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be enabled for a catch-all mailbox.