A catch-all mailbox is one that collects all the messages sent to inactive email addresses. For example, if your email address is email@example.com, but someone miswrites 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 mailbox per domain name can have this feature enabled and thus you’ll never miss emails because the other party has an obsolete address or has made a spelling error. The drawback of configuring a catch-all mailbox is that you may start receiving plenty of unsolicited bulk emails, but this problem can be rectified by using an anti-spam protection solution. It is also crucial to bear in mind that a mailbox with an activated catch-all functionality cannot redirect incoming email messages to a 3rd-party address.