08/06/06 13:24:17
URLﾘﾝｸ(privacy.msn.com)
use or contain invalid or forged headers;
use or contain invalid or non-existent domain names;
employ any technique to otherwise misrepresent, hide or obscure any information in identifying the point of origin or the transmission path;
use other means of deceptive addressing;
use a third party's internet domain name, or be relayed from or through a third party's equipment, without permission of the third party;
contain false or misleading information in the subject line or otherwise contain false or misleading content;
fail to comply with additional technical standards described below; or
otherwise violate the applicable Terms of Use for the Services.
これのどれかに引っかかってるんじゃないの？
というわけで、エンベロープfromのドメイン名が存在してないのを指定してるとかでは？