A catch-all mailbox is one that captures all the messages sent to nonexistent email addresses. For example, if your email address is firstname.lastname@example.org, but somebody miswrites it and sends an email message to email@example.com, it will still be received in the catch-all mailbox that you have set up. Only one single 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per domain can have this feature activated and in this way you’ll never miss messages because the other side has an outdated address or has made a typo.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 creating a catch-all mailbox is that you may begin receiving a lot of unsolicited bulk emails, but this issue can be rectified by using anti-spam protection software. It’s also vital to remember that a mailbox with an active catch-all feature cannot forward inbound messages to a 3rd-party email address.