I guess so, I used a throwaway email address so i didn't have to give them my email.

Valley_D0g

So this QR code you receive in the mail, ... was it an Azteco voucher?

If so, wouldn't that put you at risk of there existing a rogue employee at your e-mail provider that sniffs e-mails for those messages and then redeems the voucher for themselves?

cointastical

bitcoin

 Azteco [vouchers] now available at 28,000 locations across the UK through PayPoint | @Azteco_

cryptocoin

Used it a moment ago it was super easy, Azteco emails u a barcode, the shop scans the barcode, and then u receive a QR code to the email that u gave. The shopkeeper didn't have a clue what I was buying probably thought I was topping up the electricity. Simples!