You cannot post post in email also javascript will not run email client , the best why is to make the secure email link
for that you need to encrypt the email and put that in link
like that http://{link-to-surveypage}/{encrypt-email}
on that page you decrypt that and get the user email in safe and secure why here is the function you can use
<?php
function encrypt_decrypt($action, $string)
{
$output = false;
$key = 'P0Qst@163!#';
// initialization vector
$iv = md5(md5($key));
if ($action == 'encrypt') {
$output = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, $iv);
$output = base64_encode($output);
} else {
if ($action == 'decrypt') {
$output = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, $iv);
$output = rtrim($output, "");
}
}
return $output;
}