Four domains have used that e-mail address:
1. ChinaAdGateway.com -- The About section says: "China Ad Gateway is the premium advertising network company that serves advertisers targeting the fast-growing China market and publishers with quality contents and dedicated Chinese audience." The company's address is 61 Broadway Street, Room 800, New York, NY 10006. Their phone number is 646-688-3228.
3. IQAdnet.com -- The About page says: "IQadnet has aggregated more than 300 sites together, reaching more than 73 million unique visitors per month globally." Another page says China Ad Gateway is the "advertising brand" of IQAdnet. The company's address is 33 Whitehall St, 9th floor, New York, 10004. Their phone number is 646-688-5368. I noticed a couple job listings on Chinese-language message boards; applicants were told to e-mail "firstname.lastname@example.org." An entity called IQAdnet LLC was registered in New York state on August 5, 2014. IQAdnet LLC has two LCA forms on MyVisaJobs, and Yooshin Park is listed as the company's president.