A catch-all email mailbox is one that gathers all the emails sent to nonexistent addresses. For example, 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 configured. Just one mailbox per domain name can have this feature enabled and in this way you’ll never miss emails because the other side has an out-of-date email address or has made a spelling error. The downside of setting up a catch-all mailbox is that you may begin receiving lots of unsolicited emails, but this issue can be resolved using anti-spam filtering software. It is also crucial to remember that a mailbox with an enabled catch-all functionality cannot redirect incoming emails to a 3rd-party mailbox.