You can (or used to be able to) embed an HTML form inside an email, and clicking the submit button will perform a POST if that is the method specified. This wou

You can (or used to be able to) embed an HTML form inside an email, and clicking the submit button will perform a POST if that is the method specified. This would probably solve the issue. You avoid an extra click on the resulting page, it's a POST which matches the standard, and Google (presumably) won't hit it.