A catch-all mailbox is one that captures all the emails sent to nonexistent email addresses. For instance, if your email address is email@example.com, but somebody misspells it and sends an email message to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have set up. Only one mailbox per domain name can have this feature activated and in this way you will never miss messages because the other party has an obsolete email address or has made a typographical error. The drawback of creating a catch-all mailbox is that you may start receiving a lot of unsolicited bulk email messages, but this issue can be fixed by using anti-spam protection software. It’s also vital to know that a mailbox with an active catch-all functionality cannot redirect incoming emails to a 3rd-party address.