With the email forwarding enabled for any given address, all of the incoming email messages will be sent to a third-party address you have selected even though the latter will not be in the list of recipients and the email sender will never be aware where their e-mail will go. You can use this type of feature in case you have multiple emails since it will be far more convenient to receive all of the inbound emails in a single email address instead of logging in and out of numerous ones constantly or setting up a number of mail boxes within an e-mail app. If you manage a business or an enterprise, the email forwarding is also a method to look at all e-mails obtained by different departments for improved coordination. It's also possible to make use of this feature the opposite way round - a message sent to a standard mailbox can be sent to multiple people.