A catch-all e-mailbox is one that gathers all the messages sent to non-existent email addresses. For example, if your email address is email@example.com, but somebody misspells it and sends a message 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per domain name can have this feature activated and thus you will never miss messages because the other party has an outdated address or has made a mistake. The disadvantage of creating a catch-all mailbox is that you may begin receiving plenty of unsolicited emails, but this problem can be rectified by using an anti-spam protection solution. It’s also crucial to bear in mind that a mailbox with an enabled catch-all functionality cannot forward inbound messages to a third-party mailbox.