A catch-all email mailbox is one that collects all the email messages sent to invalid email addresses. For example, if your email address is email@example.com, but somebody misspells it and sends a message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have set up. Only one mailbox per domain name can have this feature enabled and thus you’ll never miss messages because the other side has an outdated address or has made a typo. The drawback of setting up a catch-all mailbox is that you may begin receiving lots of junk messages, but this problem can be fixed using anti-spam protection software. It’s also vital to know that a mailbox with an active catch-all feature cannot redirect incoming emails to a third-party mailbox.