The definitive source and over-seer of all that junk commercial bulk mail has been found: The Direct Marketing Association DMA is the place to go to manage all postal comercial advertising and mailings. Once you get through registration, the ability to manage your names, address(s), and types of comercial mail to be received and rejected is all a click away.
Despite the nice design of their site, one key component has been forgotten. No accessible means of registering is evident! Fortunately their customer support is very helpful and will assist anyone with this shortcoming. Of course there’s always Salona if one can’t wait. Once registered, the name, address and selection management is easy to use.

Moreover, DMA includes a link for opting out of all credit offers through the OptOutPrescreen.com website.
As stated there, "Opting-Out refers to the process for removing your name from lists supplied by the Consumer Credit Reporting Companies, Equifax, Experian, Innovis and TransUnion, to be used for firm (preapproved / prescreened) offers of credit or insurance. Your rights as a consumer under the Fair Credit Reporting Act (FCRA) include the right to “Opt-Out” for 5 years or permanently." While you can do this on the site, the visual verification is again a barier. So the easier solution is to call the opt-out hotline directly at 1-888-567-8688 and go through verification that way. The five year removal is available through the telephone hotline and a form is sent to be signed if perminent removal is desired.

In short, between DMA and OptOutPrescreen.com anyone can stop being swamped with mail that is not wanted nor useful..