A catch-all mailbox is one that collects all the messages sent to non-existent email addresses. For instance, if your email address is email@example.com, but someone miswrites 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 single mailbox per domain name can have this feature activated and thus you’ll never miss emails because the other side has an outdated address or has made a spelling mistake. The drawback of configuring a catch-all mailbox is that you may begin receiving a lot of junk email messages, but this problem can be solved using an anti-spam protection solution. It is also important to know that a mailbox with an activated catch-all functionality cannot forward inbound email messages to a third-party mailbox.