I receive emails like this from time to time. I just delete them. I really don't care if some company owns mystartupname.obscuretld, good for them. I think buying anything other than .com, .org, and .net is really a waste. Even .mobi and .co seem completely useless. Unless, of course, your main site is another TLD e.g. angel.co.

The main use of a TLD is to make it easier to type instead of IP addresses. Unless you're afraid your customers are going to start typing in yourdomain.asia on accident and actually think they are on the correct site, just ignore this.