A catch-all email mailbox is one that collects all the email messages sent to invalid email addresses. For instance, if your address is info@domain.com, but someone mistypes it and sends an email message to inof@domain.com, it will still be received in the catch-all mailbox that you have set up. Only one single mailbox per domain can have this feature enabled and in this way you will never miss emails because the other party has an obsolete email address or has made a typographical error. The downside of using a catch-all mailbox is that you may begin receiving lots of spam, but this issue can be solved by using anti-spam filtering software. It’s also important to keep in mind that a mailbox with an active catch-all feature cannot redirect incoming email messages to a 3rd-party email address.