A catch-all mailbox is one that captures all the email messages sent to invalid email addresses. For example, if your address is info@domain.com, but somebody mistypes it and sends an email message to inof@domain.com, it will still be received in the catch-all mailbox that you have created. Only one mailbox per domain name can have this feature activated and in this way you’ll never miss messages because the other side has an out-of-date address or has made a typo. The negative aspect of having a catch-all mailbox is that you may begin receiving plenty of spam, but this issue can be rectified by using an anti-spam filtering solution. It is also crucial to know that a mailbox with an active catch-all feature cannot redirect inbound emails to a third-party address.