troubleshooting Question


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cyberpassion asked on
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QMAIL PROBLEM : SPAMMERS may BE USING MY MAIL SERVER qmail-send program FOR MALICIOUS PURPOSES, I need confirmation and a successfull patch.

This is the mail alert I'm receiving every minute or so from some comcast IP addresses:

Hi. This is the qmail-send program at
I tried to deliver a bounce message to this address, but the bounce bounced!

Sorry, I couldn't find any host by that name. (#4.1.2)
I'm not going to try again; this message has been in the queue too long.

--- Below this line is the original bounce.

Return-Path: <>
Received: (qmail 2290 invoked for bounce); 17 Jul 2007 13:37:11 -0000
Date: 17 Jul 2007 13:37:11 -0000
Subject: failure notice

Hi. This is the qmail-send program at
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

Sorry, no mailbox here by that name. (#5.1.1)

--- Below this line is a copy of the message.

Return-Path: <>
Received: (qmail 1538 invoked by uid 108); 17 Jul 2007 13:36:53 -0000
Received: from (HELO (
  by with SMTP; 17 Jul 2007 13:36:53 -0000
Received: from localhost ([]
by with esmtp (Exim 4.67)
(envelope-from <>)
id 1I9DmL-000Psc-So
for; Fri, 13 Jul 2007 01:33:22 -0400
Received: from ([])
by with smtp (Exim 4.67)
(envelope-from <>)
id 1I9DmG-000Pom-P9
for; Fri, 13 Jul 2007 01:33:16 -0400
Received: from ypbyc ([]) by with Microsoft SMTPSVC(6.0.3790.1830); Fri, 13 Jul 2007 01:25:36 -0400
Message-ID: <>
Date: Fri, 13 Jul 2007 01:25:36 -0400
From: Ferrell <>
User-Agent: Thunderbird (Windows/20070509)
MIME-Version: 1.0
Subject: He is believed to be hiding with al-Qaeda leader Bin Laden on the Afghan-Pakistan border.
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Mail-Handler: MailHop by DynDNS
X-Spam-Score: 6.0 (++++++)

SZSN Expands To Become 3rd Largest Agricultural Seed Provider!

Shandong Zhouyuan Seed and Nursery Co., Ltd (SZSN)


I receive TONS of these spams with a different (random) user account.
Basically, I feel someone is trying to guess an account that is valid on my server and from that point on the attacker will flood my mailbox.

Anyone saw this before ? How can I fix it ?

I'm a beginner with qmail, so step-by-step would be appreciated (I know unix well enough though).

Best Regards,

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