World Mail Panel
2In most studies you will receive a certain amount of letters over a specific time period, in some studies the participants also send test letters. Your task is to confirm the receipt of each test letter (and possibly the posting dates of test letters) here at this website.
Depending on the kind of survey you will get a present or a gift voucher for major stores in your country (depending on the country, in some countries vouchers are also valid for Online shops).