Dear all,



For the sendmail server, it seems to still have "denial of service attack"
after re-installing the whole Redhat 9.0.In fact, such type of email is that
we let customers send their information from the internet through php
webpage. Anyway, some other hackers may attack our server through the email.



Please give me possible advice on how to eliminate such kind of rubbish
email, thanks



Regards,

John.



---------------------------------------------------------------

The feedback from the MailScanner is given as follows:



The following e-mails were found to have: Virus Detected
Sender: nobody@xx-xx.com
IP Address: 127.0.0.1
Recipient: tiaxq@email.net
Subject: Welcome to your advice
MessageID: l857AWmf003853
Quarantine:
Report: Denial of Service attack in message!

Full headers are:

Return-Path:
Received: from ns.xx-xx.com (localhost.localdomain [127.0.0.1])
by ns.xx-xx.com (8.12.8/8.12.8) with ESMTP id l857AWmf003853
for ; Wed, 5 Sep 2007 15:10:33 +0800
Full-Name: Nobody
Received: (from nobody@localhost)
by ns.xx-xx.com (8.12.8/8.12.8/Submit) id l857AWk4003851;
Wed, 5 Sep 2007 15:10:32 +0800
Date: Wed, 5 Sep 2007 15:10:32 +0800
Message-Id: <200709050710.l857AWk4003851@ns.xx-xx.com>
To: tiaxq@email.net
Subject: Welcome to your advice
From:
--
MailScanner
Email Virus Scanner
www.mailscanner.info


This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

===============================

The original message was received at Thu, 30 Aug 2007 07:51:43 +0800
from localhost.localdomain [127.0.0.1]

----- The following addresses had permanent fatal errors -----

(reason: 550 5.1.1 ... User unknown)

----- Transcript of session follows -----
.... while talking to zoso.email.net.:
>>> DATA
<<< 550 5.1.1 ... User unknown
550 5.1.1 ... User unknown
<<< 503 5.0.0 Need RCPT (recipient)