A catch-all functionality that is activated for a particular mailbox will allow you to receive email messages that are sent to addresses that do not actually exist. Otherwise put, if you deactivate an email address and somebody still sends an email to it, or to any miswritten address under the very same domain, you’ll get the email in the catch-all mailbox. Using this functionality implies that you won’t miss an email for any reason, which could be essential in case you run a company, for instance. Since you may start receiving unsolicited bulk email messages, you can combine the catch-all functionality with anti-spam filtering software in order to receive only real emails in your inbox. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be activated for a catch-all mailbox.