A catch-all email mailbox is one that captures all the email messages sent to invalid email addresses. For instance, if your address is firstname.lastname@example.org, but somebody mistypes it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have set up. Just one mailbox per domain name can have this feature enabled and in this way you will never miss emails because the other party has an out-of-date address or has made a mistake. The drawback of having a catch-all mailbox is that you may begin receiving a lot of unsolicited bulk messages, but this issue can be resolved by using anti-spam protection software. It’s also crucial to remember that a mailbox with an enabled catch-all functionality cannot forward inbound emails to a 3rd-party email address.