So I had the same issue like 10000000 other people. I did not get any confirmation e-mail to complete my trades. I heard some hotmail and gmail accounts does not get any mails from Steam because they got marked as spam mails and they get automatically blocked. I contacted Steam Support and here are their solutions: 1) Go to your e-mail account and logg in. 2) Go to your contacts and add two new contacts--> ' [email protected] ' and ' [email protected] ' Done. Good luck trading!