[horde] from_addr hook and Kronolith (from_addr field essential?)

[k bah]

 Horde 3.1.7

 I'm using Horde with a from_addr hook, here is how the from_addr is configured on horde/config/prefs.php

--------------------- horde config
$_prefs['from_addr'] = array(
    'value' => '',
    'locked' => true,
    'hook' => true,
    'shared' => true,
    'type' => 'text',
    'desc' =>  _("Your From: address:")


$_prefs['default_identity'] = array(
    'value' => 0,
    'locked' => false,
    'shared' => false,
    'type' => 'enum',
    'enum' => (isset($identity) && is_object($identity)) ? $identity->getAll('id') : array(),
    'desc' => _("Your default identity:")
);

$_prefs['id'] = array(
    'value' => 'Default Id',
    'locked' => false,
    'shared' => true,
    'type' => 'text',
    'desc' => _("Identity's name:")
);

$_prefs['fullname'] = array(
    'value' => '',
    'locked' => false,
    'hook' => true,
    'shared' => true,
    'type' => 'text',
    'desc' => _("Your full name:")
);

$_prefs['from_addr'] = array(
    'value' => '',
    'locked' => true,
    'hook' => true,
    'shared' => true,
    'type' => 'text',
    'desc' =>  _("Your From: address:")
);
--------------------- horde config


 I know I have locked the from_addr setting, so the user won't change it, but as I have a large number of users, you know users, I don't want them to change their e-mail address, since it would mess things up (specially on support calls, the user won't say he changed that).

Q1)

 I have the same for "fullname", and on MySQL I have a setting with pref_name = fullname and the user's name and surname. What I don't get is why I don't have a pref_name = from_addr properly set to existing users. Is that the expected behavior when using the from_addr hook? I need this hook to 

Q2)

  As I read on http://wiki.horde.org/KronolithReminders?referrer=HowTo# I need "from_addr" set to all users in order to Kronolith to work, right?


--------- from_addr hook code snippet ---
if (!function_exists('_prefs_hook_from_addr')) {

        ...
        ...
        ...
        if($ds) { // If we have a LDAP link
                if (is_null($user)) {
                        $user = Auth::getAuth();
                }
                $searchResult = @ldap_search($ds, $searchBase, 'uid=' . $user);
                $information = @ldap_get_entries($ds, $searchResult);

                if ($information['count'] > 0) {
                                if ($information[0]['mail'][0] != '') {
                                                $email = $information[0]['mail'][0];
                                 } else {
                                                $email = preg_replace('|~|', '@', $user); //(user = user~domain.tld)
                                 }
                                } else {
                                        $email = preg_replace('|~|', '@', $user);
                                 }

                                ldap_close($ds);
                                return (empty($email) ? '' : $email);
        }
        
--------- from_addr hook code snippet ---



 Q3) The only solution is to unlock (horde/config/prefs.php) the "from_addr" field?


 thanks in advance

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