A catch-all mailbox is one that gathers all the email messages sent to nonexistent email addresses. For instance, if your address is email@example.com, but somebody misspells it and sends an email to firstname.lastname@example.org, 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per domain name can have this feature activated and in this way you’ll never miss emails because the other party has an out-of-date address or has made a spelling mistake. The disadvantage of creating a catch-all mailbox is that you may start receiving a lot of unsolicited messages, but this problem can be solved using an anti-spam protection solution. It is also important to bear in mind that a mailbox with an enabled catch-all functionality cannot redirect inbound messages to a third-party mailbox.