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A "Catch All" email address is one that you can set up to receive any email sent to any address on your domain. For example, if you only have yourname@yourdomain.com set up, but you have it set as your catch all email, then you will also receive emails to info@yourdomain.com, admin@yourdomain.com, as well as any typos.
Setting up a catch all email is a good idea to ensure that you don't miss any emails sent to your domain. It is especially good if your name is something that is often misspelled.