A catch-all e-mailbox is one that captures all the messages sent to non-existent addresses. For example, if your email address is firstname.lastname@example.org, but somebody mistypes it and sends a message to email@example.com, it will still be received in the catch-all mailbox that you have created. Only one mailbox per domain name can have this feature activated and thus you will never miss emails because the other side has an obsolete email address or has made a spelling mistake. The downside of using a catch-all mailbox is that you may begin receiving lots of unsolicited bulk email messages, but this problem can be fixed by using anti-spam protection software. It is also essential to bear in mind that a mailbox with an activated catch-all feature cannot redirect incoming email messages to a 3rd-party address.