I was pointing at changing the story (haven't received bitcoins- received bitcoins).
Also, there is "user has never sent us email" VS "we settled everything via email".
Maybe bitmixcoin can show us emails(in case user never shows up)?
Emails are
actually easy manipulated, unlike bitcoin signed messages. (though the headers would be incorrect, but I *think* you can manually edit the header if the email is controlled by you to make it appear legit)