A catch-all mailbox is one that gathers all the email messages sent to nonexistent addresses. For instance, if your address is firstname.lastname@example.org, but someone mistypes it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have configured. Just one single mailbox per domain name can have this feature activated and in this way you’ll never miss emails because the other side has an out-of-date address or has made a typographical error. The drawback of having a catch-all mailbox is that you may start receiving plenty of spam email messages, but this issue can be fixed using anti-spam filtering software. It is also crucial to know that a mailbox with an activated catch-all feature cannot redirect incoming emails to a third-party mailbox.