If you have an email and you enable forwarding for it, all inbound e-mails will be sent to a third-party email address that you pick. The sender won't be aware of this and he will be sending the e-mail just to the first address. Such a function is useful for people with a number of web sites, each with a separate e-mail for contact, for example. By forwarding all messages to one particular email, it will be simpler for you to keep track and never miss a message because you have neglected to check a particular e-mail address. If you run an enterprise, you are able to take advantage of this feature to watch the communication received by various departments. An additional benefit is the fact that you'll be able to make use of an official e-mail address for some purposes, let’s say admin@your-domain.com, and you can now get all of the emails sent to it in your private email address. It's also possible to forward email messages from one email to numerous ones, in case a number of people needs to be involved in the email conversation.