A catch-all e-mailbox is one that gathers all the email messages sent to inactive addresses. For example, if your address is email@example.com, but somebody 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 set up. Just one single mailbox per domain name can have this feature enabled and in this way you will never miss emails because the other party has an outdated email address or has made a spelling mistake. The negative aspect of setting up a catch-all mailbox is that you may start receiving plenty of unsolicited bulk emails, but this problem can be resolved by using an anti-spam filtering solution. It is also vital to bear in mind that a mailbox with an enabled catch-all feature cannot forward inbound messages to a 3rd-party email address.