A catch-all email mailbox is one that collects all the email messages sent to nonexistent email addresses. For example, if your email address is firstname.lastname@example.org, but somebody miswrites it and sends a message to email@example.com, it will still be received in the catch-all mailbox that you have configured. Only one mailbox per domain name can have this feature activated and in this way you’ll never miss emails because the other party has an outdated email address or has made a typographical error. The negative aspect of using a catch-all mailbox is that you may begin receiving lots of spam emails, but this problem can be fixed by using anti-spam protection software. It is also essential to keep in mind that a mailbox with an activated catch-all functionality cannot forward inbound emails to a 3rd-party mailbox.