Email Forwarders have been used for quite sometime because of their simplicity in setup. A typical email forwarder is ‘yourname@yourdomainname.com’ which then forwards to an existing alternate email address like yourname@gmail.com’.
Recently, Google (gmail) changed its policy regarding email forwarders as they are recieved from the mail servers. Because of this, many mail server’s IP Address (which is the magical land where emails come from) are being blacklisted, especially from accounts that receive a large number of emails.