You should consult an attorney experienced in "unfair competition" law who is experienced in obtaining injunctive relief as well as monetary damages. In the future it would not be necessary to use identifying information such as domain addresses.
The above is general legal and business analysis. It is not "legal advise" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.