Domain Names International (InTrust Domains, DNIDomainMarket.com) has been repeatedly spamming me with emails about domains similar to ones I own. The emails come from various random domains, but when going to the domain, you are immediately redirected to dnidomainmarket.com. On the home page of their website they advertise how the BBB says they can be trusted. This general shadiness makes me not want to follow the opt out link. Also googling makes it fairly obvious that the optout will not work anyway.
I would really suggest that others receiving this spam, click the link below to the BBB and file another advertising complaint against the company. Also reporting to spam cop or similar places.