Need a Private Message Mod that work like this

[mokujin]

Not sure if it's what you need but try this code for hook private_start

PHP Code:

$lastdays = 30; // count posts from last 30 days
$lastposts = 10; // need 10 posts from last 30 days to be able to read/send PMs

$time = TIMENOW - (86400 * $lastdays);

$postcount = $vbulletin->db->query_first_slave("SELECT COUNT(*) AS posts 
        FROM " . TABLE_PREFIX . "post
        WHERE userid = " . $vbulletin->userinfo['userid'] . "
        AND dateline > " . $time . "
    ");

if ($postcount['posts'] < $lastposts)
{
    print_no_permission();
}