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Re:Have I been pwned? Check if you have an account that has ... by kevinoconnor7 on Thursday September 11, 2014 @11:11AM (#8303009)
Yes, but they would already have your e-mail address anyway. Lookup by hash precludes the case where you're giving them information they didn't already have.
Re:Have I been pwned? Check if you have an account that has ... by jdludlow on Thursday September 11, 2014 @04:18PM (#8304895)
True. I was more referring to it being a confirmation that this is an email address that anyone cares about.

If I wanted to be truly malicious I'd have my online checker return a "Nope, you're all good" and then add that email address to the short list of accounts to go after.

Re:Have I been pwned? Check if you have an account that has ... by bitJericho on Thursday September 11, 2014 @11:39AM (#8303192)
But you're still feeding into the "this is a good working address" and "this is a security newb" email lists.