A catch-all email mailbox is one that collects all the email messages sent to non-existent addresses. For example, if your email address is email@example.com, but someone mistypes it and sends an email to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have configured. Just one mailbox per domain name can have this feature activated and thus you will never miss emails because the other party has an obsolete email address or has made a spelling error. The negative aspect of configuring a catch-all mailbox is that you may begin receiving a lot of unsolicited bulk messages, but this problem can be fixed by using anti-spam filtering software. It’s also crucial to keep in mind that a mailbox with an active catch-all feature cannot redirect incoming messages to a third-party email address.