Undelivered Mail Returned to Sender как отключить!???

Undelivered Mail Returned to SenderОт кого: MAILER-DAEMON@fallback6.mail.ru (Mail Delivery System)
Кому: lokdok-91@mail.ru

Сегодня, 19:07 1 файл
This is the mail system at host fallback6.mail.ru.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<lok_gayan@yahoo.com>: delivery temporarily suspended: host
o.mx.mail.yahoo.com[66.94.237.139] refused to talk to me: 421 4.7.0 [TS01]
Messages from 94.100.176.134 temporarily deferred due to user complaints -
4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html

Reporting-MTA: dns; fallback6.mail.ru
X-mPOP-Fallback_MX-Queue-ID: C507A4AAFFAC
X-mPOP-Fallback_MX-Sender: rfc822; lokdok-91@mail.ru
Arrival-Date: Wed, 31 Aug 2011 21:18:12 +0400 (MSD)

Final-Recipient: rfc822; lok_gayan@yahoo.com
Original-Recipient: rfc822;lok_gayan@yahoo.com
Action: failed
Status: 4.7.0
Remote-MTA: dns; o.mx.mail.yahoo.com
Diagnostic-Code: smtp; 421 4.7.0 [TS01] Messages from 94.100.176.134
temporarily deferred due to user complaints - 4.16.55.1; see
http://postmaster.yahoo.com/421-ts01.html