A catch-all e-mailbox is one that gathers all the messages sent to invalid addresses. For instance, if your address is firstname.lastname@example.org, but somebody miswrites it and sends an email message to email@example.com, it will still be received in the catch-all mailbox that you have set up. Only one single mailbox per domain name can have this feature enabled and in this way you will never miss emails because the other side has an obsolete address or has made a spelling mistake. The disadvantage of using a catch-all mailbox is that you may begin receiving lots of unsolicited messages, but this issue can be fixed using anti-spam protection software. It’s also important to remember that a mailbox with an enabled catch-all feature cannot forward incoming email messages to a 3rd-party email address.