A catch-all functionality that is activated for a particular mailbox will allow you to receive emails that are sent to email addresses that do not really exist. Otherwise stated, if you remove an email address and someone still sends a message 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 will no longer miss an email for any reason, which could be essential in case you run a business, for instance. Since you may start receiving spam emails, you can combine the catch-all option with email filters in order to receive only legitimate messages in your inbox. Just one mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.