A catch-all email mailbox is one that gathers all the messages sent to non-existent 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 created. Only one single mailbox per domain name can have this feature activated and thus you’ll never miss messages because the other side has an outdated address or has made a spelling mistake. The negative aspect of creating a catch-all mailbox is that you may start receiving plenty of spam messages, but this problem can be resolved by using anti-spam protection software. It is also essential to remember that a mailbox with an enabled catch-all functionality cannot redirect incoming emails to a third-party address.