That reminds me of an academic publishing scheme–some journals ask for the names/email addresses of potential referees. There was a group that supplied bogus email addresses that led back to the original authors, who would duly reply with highly laudatory referee reports. What caught them out was that the authors sent back the bogus reports the next day or two after the journal requests; real referees wait till the last minute and even then only reply after the journal’s requested deadline and prodding by the journal editors.