A catch-all functionality that is enabled for a specific mailbox will allow you to receive email messages that are sent to email addresses that do not actually exist. To put it differently, 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 name, you’ll get the message in the catch-all mailbox. Using this functionality means that you will no longer miss an email for any reason, which could be essential if you run a company, for instance. Since you may start receiving unsolicited bulk messages, you can use the catch-all option with anti-spam filters so as to receive only authentic email 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.