How does the user resolution work

syntax error. It should be

"Now the question is, what is the expected behavior if user A logs in to drupal and posts a topic or replies in forum F ?"

Thanks for your detailed answer.

I created the smartlist_manager module which works internally similar to the mailman_manager module.

To get this working, I am thinking about something like a callback function that the list manager calls. Only if the function returns "true" the email will be forwarded to the list manager with the users email. If it returns false, it uses the "anon" email account.
Then mailman manager and smartlist_manager can implement the method to determine if a user is part of the mailing list or not. And of course the function should be able to handle admin and anonymous forum posts.

What do you think about this idea?
I am willing to provide some code/patch to make that work.

Cheers,
Ulf

I was also thinking down the line. with two differences:

I used the mailing list adress instead the forum id to pass to the hook, because the mailing list address is known to the mailman_manager and the listhandler. That way I do not need to alter the list handler configuration.

Secondly, the code allows posts to the forum, but before sending the post to the mailing list it verifies the user and if it does not exist it still sends the email, but uses the anonymous account.
Of course it would be perfect when there would be a configuration setting in listhandler to decide when the check is being done in list handler and what the outcome would be. I did not go down that path though, and the following solution works for me.

Besides the listhandler patch that I attached, here the code that I added to my smartlist_manager module to do the actual check if the user is subscribed to the mailing list. It could be added to mailman_manager as well:

//copied from listhandler module
define('ERR_LISTHANDLER_WRONG_HOOK', -98);

/**
* implementation of hook_listhandler_user
* @param $op is the kind of operation
* @param $usr is the user object being passed in (could be anonymous)
* @param $mailinglist string is the mailinglist we refering to.
*/
function smartlist_manager_listhandler_user($op, $usr, $mailinglist)
{
  switch ($op)
  {
    case 'exists':
      if (!$usr->uid) {
        return false; //anonymous user
      }
      else
      {
        $lists = _smartlist_manager_get_lists();

        if (count($lists) == 0)
          return ERR_LISTHANDLER_WRONG_HOOK;

        foreach ($lists as $list) {
          if ($list['name'] == $mailinglist)
          {
            $subscrip = _smartlist_manager_get_subscriptions($usr->uid, $list['lid']);
            if ($subscrip['lstatus'] == 0)
              return false; //the user that posted the topic is not part of the mailing list.
            else
              return true;
          }
        }
        //could not find any matching mailing list.
        return ERR_LISTHANDLER_WRONG_HOOK;
      }
      break;
  }

  return ERR_LISTHANDLER_WRONG_HOOK;
}