Create an USPS official email site where people can receive digital mail on an official USPS platform.

Have the USPS create an official USPS email account where only officially approved mail can be received by the public. In this way they can charge companies a lower rate on the digital front when sending out advertisments and official mail. This will save companies money, but also will allow the USPS to have a source of creating revenue on the digital front. Spam would not be possible because all mail going to the public would have to meet guidelines and of course pay the USPS for digital delivery. In other words this would create an official email mailbox for each address.