I'm not sure how sensitive this piece of information is considered (don't throw stones), but I was wondering how SO calculates the email hash. We want to check if certain people for which we have the email addresses are also on SO. BTW, this is for academic research.
As far as we have seen,
md5(email_address) does not match any entry in the SO data dump. So probably it's not exactly
md5(email_address), but something else. Can you disclose how this works or is it private?