The E-Mail Preference Service and e-mps.org were previously owned by the Direct Marketing Association (DMA).
In 2018, the Association of National Advertisers (ANA) acquired the DMA. They kept the email preference service and registry but sold the domain name to us.
So, e-mps.org is no longer affiliated with either of those organizations.
However, the email opt-out (do not email me) service for consumers still operates within the ANA.
We are happy to point you in the right direction. Here is the email removal request link:
Get off commercial US email lists
The e-mps team