automated block bulk check contact display displays download email emails filter filters folder iframe inbox instructions messege page passed pasted product questions redirrect replaced seller spam thankyou transaction txn url

I have pasted the https://www.e-junkie.com/ecom/rp.php? txn_id=txn_id_that_we_passed_to_your_page in the iFrame and set the redirrect to my URL and it does go to my URL. But does not display the download/thankyou page?
Instead displays this messege in the iFrame;

"Please check your email for further instructions about your product(s). Sometimes spam filters block automated emails. If you do not find the email in your inbox, please check your spam filter or bulk email folder. Please contact the seller for any questions"

txn_id_that_we_passed_to_your_page must be replaced with the actual transaction ID that we pass.