A catch-all email mailbox is one that captures all the messages sent to inactive email addresses. For instance, if your email address is firstname.lastname@example.org, but someone misspells 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one mailbox per domain can have this feature enabled and thus you’ll never miss messages because the other side has an outdated email address or has made a typo. The drawback of setting up a catch-all mailbox is that you may start receiving plenty of unsolicited bulk messages, but this issue can be resolved using anti-spam filtering software. It is also essential to keep in mind that a mailbox with an enabled catch-all feature cannot forward incoming email messages to a 3rd-party mailbox.