A catch-all e-mailbox is one that captures all the email messages sent to nonexistent addresses. For instance, if your address is email@example.com, but someone 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. Just one single mailbox per domain can have this feature enabled and in this way you will never miss emails because the other side has an out-of-date address or has made a typographical error. The downside of having a catch-all mailbox is that you may start receiving plenty of spam, but this problem can be solved by using an anti-spam filtering solution. It’s also essential to know that a mailbox with an enabled catch-all functionality cannot redirect incoming emails to a third-party email address.