A catch-all e-mailbox is one that gathers all the email messages sent to non-existent email addresses. For example, if your address is email@example.com, but somebody mistypes it and sends a message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have configured. Just one mailbox per domain can have this feature activated and in this way you’ll never miss messages because the other side has an out-of-date email address or has made a spelling mistake. The negative aspect of using a catch-all mailbox is that you may start receiving plenty of unsolicited bulk email messages, but this problem can be rectified using an anti-spam protection solution. It’s also important to bear in mind that a mailbox with an active catch-all feature cannot forward incoming messages to a third-party address.