A catch-all e-mailbox is one that gathers all the emails sent to nonexistent addresses. For instance, if your address is firstname.lastname@example.org, but somebody misspells it and sends a message to email@example.com, it will still be received in the catch-all mailbox that you have configured. Only one single mailbox per domain name can have this feature activated and in this way you will never miss emails because the other side has an outdated address or has made a spelling error. The drawback of creating a catch-all mailbox is that you may begin receiving a lot of unsolicited bulk messages, but this issue can be solved using anti-spam protection software. It is also crucial to remember that a mailbox with an enabled catch-all functionality cannot forward incoming email messages to a third-party mailbox.