A catch-all email mailbox is one that captures all the email messages sent to nonexistent email addresses. For instance, if your address is firstname.lastname@example.org, but somebody miswrites it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have created. Just one mailbox per domain can have this feature enabled and in this way you will never miss messages because the other party has an outdated address or has made a spelling mistake. The downside of creating a catch-all mailbox is that you may begin receiving a lot of unsolicited bulk emails, but this issue can be solved by using an anti-spam protection solution. It’s also essential to keep in mind that a mailbox with an enabled catch-all functionality cannot forward inbound emails to a 3rd-party email address.