spammer is emailing a non existent user on my server.

qmailtoaster is accepting the email and then trying to respond back

my queue is flooding because ot this

should'nt chkuser be directly bouncing the email during smtp transaction time 
when email id is not present on the server ?

pl see below the message trapped in my queue. kindly let me know how i could 
prevent these

thanks for your help

rajesh

log files

@400000005616a19e352eb154 info msg 1840641: bytes 60095 from 
<[email protected]> qp 40028 uid 89
@400000005616a19e36a305bc starting delivery 1066: msg 1840641 to local 
[email protected]
@400000005616a19e36a328e4 status: local 1/200 remote 60/60
@400000005616a19e374ed234 delivery 1066: failure: 
Sorry,_no_mailbox_here_by_that_name._(#5.1.1)/


sample bounce message

Received: (qmail 5240 invoked for bounce); 8 Oct 2015 17:23:48 -0000
Date: 8 Oct 2015 17:23:48 -0000
From: [email protected]
To: [email protected]
Subject: failure notice

Hi. This is the qmail-send program at ns1.bizmailserver.net.
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.

<[email protected]>:
Sorry, no mailbox here by that name. (#5.1.1)

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

Return-Path: <[email protected]>
Received: (qmail 3803 invoked by uid 89); 8 Oct 2015 17:19:29 -0000
Received: by simscan 1.4.0 ppid: 3636, pid: 3743, t: 2.9901s
         scanners: attach: 1.4.0 clamav: 0.98.6/m: spam: 3.3.2
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on
        ns1.bizmailserver.net
X-Spam-Level:
X-Spam-Status: No, score=0.0 required=5.0 tests=T_FROM_12LTRDOM
        autolearn=disabled version=3.3.2
Received: from unknown (HELO redbrokerage.com.inbound10.mxlogicmx.net) 
(187.234.134.4)
  by ns1.bizmailserver.net with SMTP; 8 Oct 2015 17:19:26 -0000
Received-SPF: unknown (ns1.bizmailserver.net: domain at listrak does not 
designate permitted sender hosts)
Received: from redbrokerage.com.inbound10.mxlogicmx.net 
(redbrokerage.com.inbound10.mxlogicmx.net [208.65.144.3])
        by redbrokerage.com (Outbound Mail Relay) with ESMTP id yZSt49AdKNeARht0
        for <[email protected]>; Thu, 08 Oct 2015 13:19:29 -0400 
(EDT)
MIME-Version: 1.0
Message-ID: <[email protected]>
Date: Thu, 08 Oct 2015 13:15:29 -0400
From: "Noemie Considine" <[email protected]>
To: [email protected]
Subject: contract
Content-Type: multipart/mixed;
 boundary="------------070709070301020805080405"
--------------070709070301020805080405
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit

Dear customer,

I'm sending you a new contract of the project (Private collateral statement of 
account)

--------------070709070301020805080405
Content-Type: application/zip; name="Private collateral statement of 
account.zip"
Content-Description: "Private collateral statement of account.doc"
Content-Disposition: attachment; filename="Private collateral statement of 
account.zip"; size=43024;
        creation-date="Thu, 08 Oct 2015 13:16:29 -0400";
        modification-date="Thu, 08 Oct 2015 13:17:29 -0400"
Content-Transfer-Encoding: base64



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