Someone not getting a response shouldn't be possible.. our workflows aren't setup that way. That's not to say that it hasn't happened, but when it does it's usually for a technical reason outside of our immediate control (e.g. user's spam filters).
Happy to de-bug the issue publicly on hackernews, but so far I can't find any record of a user with an email/name similar to that username, and the user hasn't contacted me.
Any plans to be responsive to customers that don't know a slightly insider-y venue to make your company look bad?