Encoding email address in URL form submission

Hi all,

I need to encode an email address in a URL that is calling a Responsys hosted form directly (i.e. the link table is using the form's URL and _ri_ ID to submit data directly to it). I have seen that if I add a dynamic variable to the data sources called ENCODED_EMAIL, and set this to be ${EMAIL_ADDRESS?hex}, it masks the email in the submission URL when called - however, this will not pass the email address to the form, which is using the EMAIL_ADDRESS_ as the submission key.

Has anyone had success in encoding the email address for a form URL submission and the form successfully picking up the email address from this encoding?