A catch-all e-mailbox is one that captures all the emails sent to invalid addresses. For example, if your email address is firstname.lastname@example.org, but somebody mistypes it and sends an email message to email@example.com, 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per domain can have this feature activated and in this way you’ll never miss messages because the other side has an out-of-date address or has made a spelling mistake. The negative aspect of creating a catch-all mailbox is that you may begin receiving plenty of spam email messages, but this issue can be rectified using anti-spam protection software. It is also essential to keep in mind that a mailbox with an active catch-all functionality cannot forward inbound emails to a third-party address.