A catch-all email mailbox is one that captures all the email messages sent to non-existent email addresses. For instance, if your address is firstname.lastname@example.org, but somebody misspells it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have set up. Only one mailbox per domain name can have this feature activated and in this way you will never miss emails because the other side has an out-of-date email address or has made a typographical error. The negative aspect of setting up a catch-all mailbox is that you may begin receiving a lot of unsolicited emails, but this problem can be solved using anti-spam filtering software. It is also essential to bear in mind that a mailbox with an active catch-all functionality cannot forward inbound email messages to a 3rd-party mailbox.