A catch-all email mailbox is one that collects all the email messages sent to nonexistent email addresses. For example, if your email address is firstname.lastname@example.org, but someone misspells it and sends a message to email@example.com, it will still be received in the catch-all mailbox that you have set up. Only one single mailbox per domain can have this feature enabled and thus you’ll never miss messages because the other side has an obsolete email address or has made a spelling mistake. The downside of using a catch-all mailbox is that you may begin receiving plenty of unsolicited email messages, but this problem can be solved by using an anti-spam filtering solution. It is also essential to know that a mailbox with an active catch-all functionality cannot forward inbound messages to a 3rd-party mailbox.