What is “Catch-all” or “Wildcard” E-mail?
Catch-all E-mail means that e-mail that is sent to anyword@yourdomain.com will go to your mailbox. So even if someone makes a mistake typing your user name, the message will still get to you as long as they get the spelling of the domain name right. Many clients request that catch-all e-mail be disabled if they are receiving too much spam.