# assume $session is via Apache::Session 
$session->{'email_targets'} = {
"john@doe.com" => {
                    'first_name' => 'John',
                    'last_name'  => 'Doe'
                   },
"jane@doe.com" => {
                    'first_name' => 'Jane',
                    'last_name'  => 'Doe'
                  }
};