email register not sent (Bugs)
The same problem also affects the forgotten password email. On a Windows server you'll want to change line 183 of login.inc.php from
$pwf_mailto = my_mb_encode_mimeheader($field["user_name"], CHARSET, "Q")." <".$field["user_email"].">";
to:
$pwf_mailto = $field["user_email"];
Hope this helps somebody!