A catch-all email mailbox is one that collects all the messages sent to non-existent addresses. For instance, if your address is email@example.com, but someone mistypes 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. Just one mailbox per domain can have this feature enabled and thus you will never miss emails because the other side has an obsolete address or has made a spelling error. The drawback of using a catch-all mailbox is that you may start receiving plenty of junk email messages, but this issue can be rectified by using anti-spam protection software. It’s also vital to remember that a mailbox with an activated catch-all feature cannot redirect incoming messages to a 3rd-party address.