I received a similar email from a company years ago but it was a bit different and not so aggressive. Their legal dept was curious as to why I bought the domain

I received a similar email from a company years ago but it was a bit different and not so aggressive. Their legal dept was curious as to why I bought the domain.I explained my purpose for using the domain, and did so in a nice, polite (even friendly) way. She wrote back and said that was fine. That was in 2005 and I never heard from them again. I had a legitimate use of the domain name that helped both parties and I guess it "passed" whatever criteria they had at the time. Maybe you could try the same approach. IANAL and all that...