A catch-all mailbox is one that gathers all the email messages sent to inactive email addresses. For example, if your email address is firstname.lastname@example.org, but somebody mistypes it and sends a message to email@example.com, it will still be received in the catch-all mailbox that you have created. Just one single mailbox per domain can have this feature enabled and in this way you’ll never miss messages because the other party has an obsolete address or has made a typographical error. The downside of creating a catch-all mailbox is that you may begin receiving lots of unsolicited bulk emails, but this issue can be resolved by using an anti-spam protection solution. It is also essential to remember that a mailbox with an activated catch-all feature cannot forward incoming messages to a third-party address.