Postfix + Endian Saldırı

Arkadaşlar Merhaba, endian smtp proxy + arkasında postfix mail sunucu çalıştırıyorum fakat sürekli olarak saldırı almaktayım. Örnek header log aşağıdaki gibi. Nasıl bir koruma almam gerekir ?

The reason for the problem:
4.3.2 - Not accepting messages at this time 421-"RP-001 (SNT0-MC1-F39) Unfortunately, some messages from 121.241.224.3 weren't sent. Please try again. We have limits for how many messages can be sent per hour and per day. You can also refer to  http://mail.live.com/mail/ troubleshooting.aspx#errors."


Reporting-MTA: dns; smtpin2.mailsecure.in

Final-Recipient: rfc822;[email protected]
Action: delayed
Status: 4.0.0 (temporary failure)
Remote-MTA: dns; [65.55.92.136]
Diagnostic-Code: smtp; 4.3.2 - Not accepting messages at this time 421-"RP-001 (SNT0-MC1-F39) Unfortunately, some messages from 121.241.224.3 weren't sent. Please try again. We have limits for how many messages can be sent per hour and per day. You can also refer to  http://mail.live.com/mail/ troubleshooting.aspx#errors." (delivery attempts: 14)
Will-Retry-Until: 21 Oct 2012 10:23:40 +0530

X-IronPort-AV: E=Sophos;i="4.80,597,1344191400";
   d="scan'208";a="395557358"
Received: from mailrelay1.mstcindia.co.in (HELO localhost.localdomain) ([202.54.75.45])
  by smtpout2.mailsecure.in with ESMTP; 17 Oct 2012 10:23:37 +0530
Received: from 217.71.248.129 ([217.71.248.129])
        by localhost.localdomain (8.13.1/8.13.1) with SMTP id q9H5D0Ju017975
        for <[email protected]>; Wed, 17 Oct 2012 10:43:08 +0530
Message-ID: <A2EB7A24BE06492486D8027BBE80E[email protected]>
From: "D.A" <[email protected]>
To: "mellisp" <[email protected]>
Subject: hello gentleman
Date: Wed, 17 Oct 2012 07:13:00 +0200
MIME-Version: 1.0
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2900.5931
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6109
Content-Type: text/plain; format="flowed"; charset="windows-1252"; reply-type="original"
Content-Transfer-Encoding: quoted-printable

How do you do
I want to find a person, who will be for me not only a loving husband, but =
also
a good friend. He have to be reliable, sincere, with a good sense of humour=
 and
kind heart. I want to meet a man, who feels lonely without love, the same as
I am  http://searchyourwoman.ru/
I am looking for man who is ready for serious relations, honest and strong =
partner.
Have a nice day
Dya

The information contained in this electronic message and any attachments to=
 this message are intended for the exclusive use of the addressee(s) and ma=
y contain proprietary, confidential or privileged information. If you are n=
ot the intended recipient, you should not disseminate, distribute or copy t=
his e-mail. Please notify the sender immediately and destroy all copies of =

this message and any attachments contained in it.