"email sent" appearing in post request responses - php

Question

I was wondering if someone could help me figure out where this could be coming from.
Here is a successfull transaction:
Response received: HttpResponse{body='Status=OK
RedirectURL=https://www.furnitureclinic.co.uk/orderSuccessful?VendorTxCode=fclinic-170720105629-212955392
', statusCode=200, statusMessage='OK'}
And here a failed transaction:
Response received: HttpResponse{body='email sentStatus=OK
RedirectURL=https://www.handbagclinic.co.uk/Checkout?VendorTxCode=fclinic-170720105715-107422623
', statusCode=200, statusMessage='OK'}
As you can see in the failed transaction, after body=, it says email sentStatus=OK rather than just Status=OK.
This causing payments to Sage to fail.
I would just like to know, at which point in the payment process does this response get sent, and what could possibly be causing this to happen.
I have looked through the entire Notification URL file and no mention of "email sent" ever shows up.

Answer 1

This is the last step of a Server transaction - Sage Pay will call back to you with the Notification post, which it looks like you are getting, and you respond with the 'OK' message and a redirect URL (to send the consumer's browser off to wherever).
However, if you are sending all that through, it's as if you are telling Sage Pay to reject the transaction.
I recommend setting up a simple script on your NotificationURL, which just replies (to the notification POST) with:
Status=OK
statusMessage=Fine
RedirectURL=<wherever>
And then re-introduce the complexity of signature checking etc. afterwards...