A catch-all mailbox is one that captures all the emails sent to nonexistent email addresses. For example, if your email address is info@domain.com, but someone 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per domain can have this feature activated and in this way you’ll never miss messages because the other side has an outdated address or has made a typo. The downside of setting up a catch-all mailbox is that you may begin receiving lots of unsolicited bulk email messages, but this problem can be solved by using an anti-spam protection solution. It’s also important to bear in mind that a mailbox with an enabled catch-all feature cannot redirect inbound messages to a third-party address.