A catch-all e-mailbox is one that gathers all the emails sent to nonexistent email addresses. For example, if your email address is email@example.com, but someone mistypes it and sends an email message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have configured. Only one single mailbox per domain name can have this feature enabled and in this way you’ll never miss emails because the other side has an obsolete address or has made a spelling mistake. The negative aspect of using a catch-all mailbox is that you may start receiving a lot of junk messages, but this problem can be resolved by using anti-spam filtering software. It’s also vital to bear in mind that a mailbox with an active catch-all functionality cannot redirect incoming messages to a 3rd-party email address.