A catch-all mailbox is one that gathers all the email messages sent to invalid addresses. For instance, if your email address is email@example.com, but someone misspells it and sends a message to firstname.lastname@example.org, 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mailbox per domain can have this feature enabled and in this way you’ll never miss emails because the other side has an outdated address or has made a spelling mistake. The disadvantage of using a catch-all mailbox is that you may start receiving lots of unsolicited emails, but this problem can be fixed using an anti-spam filtering solution. It’s also crucial to know that a mailbox with an enabled catch-all functionality cannot redirect inbound emails to a third-party mailbox.