A catch-all mailbox is one that captures all the messages sent to inactive addresses. For instance, if your address is firstname.lastname@example.org, but somebody miswrites it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have set up. Only one mailbox per domain name can have this feature enabled and thus you’ll never miss messages because the other party has an obsolete address or has made a spelling error. The disadvantage of configuring a catch-all mailbox is that you may begin receiving a lot of unsolicited email messages, but this issue can be solved by using an anti-spam protection solution. It’s also crucial to remember that a mailbox with an activated catch-all functionality cannot forward inbound email messages to a 3rd-party email address.