A catch-all email mailbox is one that captures all the emails sent to invalid email addresses. For instance, if your email 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. Just one mailbox per domain can have this feature activated and thus you’ll never miss messages because the other side has an out-of-date email address or has made a spelling error. The disadvantage of having a catch-all mailbox is that you may begin receiving a lot of junk email messages, but this problem can be resolved by using an anti-spam protection solution. It’s also vital to remember that a mailbox with an active catch-all feature cannot redirect inbound email messages to a 3rd-party address.