A catch-all email mailbox is one that gathers all the email messages sent to non-existent addresses. For instance, if your email 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 set up. Just one mailbox per domain can have this feature enabled and in this way you will never miss emails because the other side has an out-of-date address or has made a typographical error. The disadvantage of using a catch-all mailbox is that you may begin receiving a lot of spam emails, but this issue can be rectified by using an anti-spam protection solution. It is also vital to bear in mind that a mailbox with an enabled catch-all functionality cannot forward inbound emails to a third-party address.