Vortex, i didn't try this
but in usercp_register.php
- $sql = "INSERT INTO " . PRIVMSGS_TABLE . " (privmsgs_type, privmsgs_subject, privmsgs_from_userid, privmsgs_to_userid, privmsgs_date, privmsgs_enable_html, privmsgs_enable_bbcode, privmsgs_enable_smilies, privmsgs_attach_sig) VALUES ('0', '" . str_replace("'", "''", addslashes(sprintf($register_pm_subject,$board_config['sitename']))) . "', '2', " . $user_id . ", " . $privmsgs_date . ", '0', '1', '1', '0')";
There is a "2" , maybe it's the sender id
Try to change it and let me know