A catch-all email mailbox is one that collects all the messages sent to inactive email addresses. For example, if your address is email@example.com, but somebody miswrites it and sends an email message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have set up. Only one mailbox per domain name can have this feature activated and thus you will never miss messages because the other side has an out-of-date email address or has made a typographical error. The downside of configuring a catch-all mailbox is that you may start receiving a lot of unsolicited email messages, but this problem can be fixed using anti-spam filtering software. It’s also essential to remember that a mailbox with an enabled catch-all functionality cannot forward inbound emails to a third-party email address.