You are correct - but - at your initial point of contact you have (perhaps) a single opportunity to make contact with your prospective customer. You should do a

You are correct - but - at your initial point of contact you have (perhaps) a single opportunity to make contact with your prospective customer. You should do all you can (without boring or annoying your prospect) to capture enough accurate information to ensure that the next step succeeds. I agree - long term relationships are built on (in the context of this conversation) an exchange of emails but why blow it at the first hurdle?