A catch-all e-mailbox is one that collects all the messages sent to non-existent email addresses. For instance, if your address is info@domain.com, but someone miswrites it and sends an email to inof@domain.com, it will still be received in the catch-all mailbox that you have configured. Just one single mailbox per domain name can have this feature activated and in this way you will never miss emails because the other side has an out-of-date address or has made a spelling error. The negative aspect of setting up a catch-all mailbox is that you may begin receiving a lot of junk emails, but this problem can be rectified by using anti-spam protection software. It is also vital to know that a mailbox with an active catch-all feature cannot forward inbound messages to a 3rd-party address.