Cheating winner

i just create a giveaway and there is a strange winner, i cant send him the gift by e-mail, because my gmail account cant send it to this pranasasxx@inbox.lt ...then i decided to contact him via Steam, then i saw this http://steamcommunity.com/id/pranasasxx/
Last Online: 27 days ago
0 hours played (8 games owned)

He has a friend in his friend-list with the same name as he.

He is probably joining SG giveaways with 2 accounts at once.

Help me, support, thanks.