A catch-all email mailbox is one that captures all the messages sent to non-existent addresses. For instance, if your email 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 set up. Just one single mailbox per domain can have this feature activated and in this way you’ll never miss emails because the other party has an outdated email address or has made a spelling error. The drawback of using a catch-all mailbox is that you may begin receiving a lot of spam messages, but this issue can be resolved by using an anti-spam filtering solution. It is also essential to bear in mind that a mailbox with an active catch-all feature cannot redirect inbound emails to a 3rd-party mailbox.