A catch-all e-mailbox is one that collects all the email messages sent to invalid addresses. For instance, if your address is email@example.com, but someone miswrites it and sends a message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have created. Only one single mailbox per domain name can have this feature activated and in this way you will never miss messages because the other party has an obsolete address or has made a spelling mistake. The downside of using a catch-all mailbox is that you may begin receiving plenty of unsolicited bulk email messages, but this issue can be solved by using anti-spam protection software. It’s also important to bear in mind that a mailbox with an active catch-all feature cannot redirect incoming emails to a 3rd-party email address.