A catch-all 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 misspells it and sends an email message to inof@domain.com, it will still be received in the catch-all mailbox that you have created. Only one single mailbox per domain can have this feature enabled and thus you’ll never miss emails because the other side has an obsolete email address or has made a typo. The downside of creating a catch-all mailbox is that you may begin receiving plenty of spam, but this problem can be fixed by using an anti-spam protection solution. It is also important to bear in mind that a mailbox with an activated catch-all feature cannot forward incoming emails to a third-party email address.