A catch-all email mailbox is one that gathers all the messages sent to nonexistent addresses. For instance, if your address is firstname.lastname@example.org, but someone mistypes it and sends a message to email@example.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per domain can have this feature activated and in this way you will never miss messages because the other side has an out-of-date email address or has made a mistake. The negative aspect of using a catch-all mailbox is that you may start receiving a lot of spam messages, but this issue can be fixed using anti-spam protection software. It’s also essential to keep in mind that a mailbox with an enabled catch-all feature cannot forward inbound emails to a third-party address.