A catch-all mailbox is one that gathers all the email messages sent to non-existent email addresses. For instance, if your email address is email@example.com, but someone miswrites it and sends an email message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have configured. Only one mailbox per domain name can have this feature enabled and thus you’ll never miss messages because the other side has an outdated address or has made a mistake. The negative aspect of creating a catch-all mailbox is that you may start receiving plenty of spam messages, but this issue can be fixed by using an anti-spam filtering solution. It is also crucial to know that a mailbox with an enabled catch-all feature cannot forward inbound emails to a 3rd-party mailbox.