A catch-all mailbox is one that gathers all the email messages sent to non-existent addresses. For instance, if your address is email@example.com, but someone miswrites it and sends a message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have configured. Only one mailbox per domain can have this feature activated and thus you will never miss messages because the other party has an outdated email address or has made a typographical error. The drawback of having a catch-all mailbox is that you may start receiving a lot of unsolicited bulk email 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 functionality cannot forward incoming messages to a third-party mailbox.