MailAddress recipient1 = new MailAddress("foo@contoso.com");
            MailAddress recipient2 = new MailAddress("bar@contoso.com");
            MailAddress sender = new MailAddress("thorerik.lie@gmail.com", "Thor Erik Lie");

            MailAddressCollection carbonCopy = new MailAddressCollection();

            carbonCopy.Add(recipient1);
            carbonCopy.Add(recipient2);
            carbonCopy.Add(sender);