Node Action Commands

Hi there. I am trying to integrate the twitter module and mailhandler.

I've looked at the code of the twitter_post.module and have found that there exists a node action for node->twitter and $node->twitter['post']. Based on this, I've included in the mailhandler command twitter: 1 to allow for automatic posting into twitter. This seems to have worked since I get the message 'Successfully posted to Twitter' after retrieving mail - which indicates to me that the twitter module is happy (for a look under the hood see code at the end of this post). Further, the twitter module functions fine when content is submitted via the website. This leads me to beleive that there is some issue with the mailhandler commands that I am not understanding since no content is posted to twitter when submitted via email. Is there something that I am missing as far as mailhandler commands is concerned? Is this a mailhandler bug?

function twitter_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
  global $user;
  switch ($op) {
    case 'insert':
    case 'update':
      if (!empty($node->status) && !empty($node->twitter) && !empty($node->twitter['post'])) {
        module_load_include('inc', 'twitter');

        $twitter_account = twitter_account_load($node->twitter['account']);
        $replacements = array('!title' => $node->title,
                              '!url' => url('node/'. $node->nid, array('absolute' => TRUE, 'alias' => TRUE)),
                              '!url-alias' => url('node/'. $node->nid, array('absolute' => TRUE)),
                              '!user' => $node->name);
        // Only generate the shortened URL if it's going to be used. No sense
        // burning through TinyURLs without a good reason.
        if (strstr($node->twitter['status'], '!tinyurl') !== FALSE) {
          $replacements['!tinyurl'] = twitter_shorten_url(url('node/'. $node->nid, array('absolute' => TRUE)));
        }

        $status = strtr($node->twitter['status'], $replacements);
        try {
          $result = twitter_set_status($twitter_account, $status);
          drupal_set_message(t('Successfully posted to Twitter'));
        }
        catch (TwitterException $e) {
          drupal_set_message(t('An error occurred when posting to twitter: %code %error',
                               array('%code' => $result->code, '%error' => $result->error)), 'warning');
        }
      }
      break;
  }
}