A catch-all email mailbox is one that collects all the messages sent to inactive addresses. For instance, if your address is email@example.com, but someone misspells it and sends a message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have configured. Just one single mailbox per domain name can have this feature enabled and thus you’ll never miss messages because the other party has an out-of-date address or has made a mistake. The drawback of setting up a catch-all mailbox is that you may begin receiving plenty of junk email messages, but this issue can be rectified using anti-spam filtering software. It’s also important to remember that a mailbox with an active catch-all feature cannot forward inbound email messages to a third-party mailbox.