A catch-all email mailbox is one that collects all the messages sent to invalid email addresses. For instance, if your email address is info@domain.com, but somebody mistypes it and sends a message to inof@domain.com, it will still be received in the catch-all mailbox that you have configured. Only one single mailbox per domain can have this feature activated and in this way you’ll never miss messages because the other party has an out-of-date email address or has made a spelling mistake. The negative aspect of having a catch-all mailbox is that you may start receiving a lot of unsolicited bulk messages, but this problem can be rectified by using anti-spam protection software. It’s also crucial to remember that a mailbox with an active catch-all functionality cannot redirect incoming email messages to a third-party email address.