<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hello!<br/> <br/> Several years ago I already got a postcard with a verification code to prove that my postal address is correct. And this was not a paid service but a large freemailer with thousands of customers. So, no it's not rocket science and yes it was already done this way in large quantities (by another service provider).<br/> <br/> Best regards,<br/> <br/> Karl-Josef Ziegler<br/> <div class="moz-signature"> </div> </div></div></body></html>