Passing Variables to a "form to email" on a different page

I am looking for some design advice please.

I have a page created from a table with one row for each user record in the database.

I want to have a button to invoke a form to allow the “form to email” functionality on a different page to allow an email to be sent to the selected user. I know how to do this using URL parameters and GET variables but I would like better security rather than exposing the record ID of the user in the URL string. The information to be passed is the full user name and email address.

What would be a good approach to take ?