Developer manual

Simplest class and method you may write to dynamically create a recipient list.

class user_testList {
    public function myRecipientList(array &$params, $pObj) {
        $params['lists']['PLAINLIST'][] = array(
            'name' => 'John Doo',
            'email' => 'john.doo@gmail.com',
        );
        $params['lists']['PLAINLIST'][] = array(
            'name' => 'Foo Bar',
            'email' => 'foo.bar@yahoo.fr',
        );
    }
}

If you wish to provide records from tables tt_address or fe_users, this is easily done with:

// Add tt_address record with uid 12 to the list
$params['lists']['tt_address'][] = 12;

// Add fe_users record with uid = 14 to the list
$params['lists']['fe_users'][] = 14;