A company that provides a controversial service to domain name registrars says it is severing ties with Estdomains amid complaints that the Eastern European company makes it too easy to register sites that are used by spammers and scammers. Directi, through a subsidiary called LogicBoxes, had been providing an array of products and services to Estdomains, including one known as PrivacyProtect, which shields the identity of domain-name owners.