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The complainer took the time to research the contact information for the domain, hosting company, and DNS company; wrote an e-mail complaining about the incorrect information and alluded to a loss of revenue resulting from the incorrect information (the guy's a lawyer, so of course there was the subtle hint of lawsuit); and sent it to all the above contacts. Yet he failed to include either:
A) What he wants done about it, or
B) What the correct information actually is!
I once had one wanted to be removed from the mailing list but kept emailing me from a different address and wouldn't say which one we were mailing to.
On the other hand it could be malicious. As co-editor of a printed music magazine I know that we have been embarassed twice by incorrect listings information, once was deliberate misinformation and the other was in good faith from a third party but just plain wrong. We are a lot more careful now about actioning changes to our listings.
Your action will depend:
1. on the nature of the listing (paid or free) and the nature of the "error". Was it a mistake or had they failed to advise you of a change?
2. if you can validate the email as legitimate and the sender has having the authority implied.