Предлагаю bounce/forward подобные письма на адрес [EMAIL PROTECTED] - судя по MX это их клиент. Может хоть так подействует.
Begin forwarded message: Date: Thu, 25 Jul 2002 09:20:30 +0300 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Mail Delivery Error No such user: [EMAIL PROTECTED] -- jabber: [EMAIL PROTECTED] VEL-RIPE -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]