A catch-all e-mailbox is one that captures all the email messages sent to invalid email addresses. For instance, if your email address is email@example.com, but somebody mistypes it and sends a message to firstname.lastname@example.org, 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 messages because the other side has an obsolete email address or has made a mistake. The downside of configuring a catch-all mailbox is that you may begin receiving plenty of junk email messages, but this problem can be resolved by using anti-spam filtering software. It is also essential to bear in mind that a mailbox with an active catch-all functionality cannot redirect inbound emails to a third-party address.