Band name question

[Dange]

My band got this email from a guy in america:

hello,

this is a very friendly and kind cease and desist order for you to refrain from using the name "echo chamber" as your band name from this day forward. i have used this name for my britpop/indie band since 1995 and released two independant cd's with the inprint. i have also registered www.echochamber.net and mainted this site since. we cater to the same genre and don't any future confusion going forward. we have perfrormed hundreds of shows and opened for such seminal groups as "modern english," "gene loves jezebel," and a "smiths/morrissey" tribute just to name a few. please respond with a positive reply to avoid future action.

cheers mates,

echo chamber (u.s.)

Now he doesnt mention he owns any rights to the name, or if has a leg to stand on legally, so i want to find out whether he owns the copyright? Anyone know where i can do this? If he does then fair enough and we'll ahve to change our name, but if not then i can send his a nice friendly cease and decist order for him to refrain from emailing me again.