This appears to be a know issue per the help topic here: https://www.paypal.com/cy/smarthelp/article/why-does-ipn-validation-return-an-html-page-instead-of-v...
But, this is occurring several times a week -- not rare cases as the help item states. Does anyone have insight as to what might be going on with PayPal IPN servers to cause this to happen so frequently? If this is being triggered by something I'm doing incorrectly I'd like to fix it. If not, something needs to be done at PayPal's end.
Thanks for your help,
-Lee
