backscatter / ndr / smtp auth issues

Garrod M. Alwood Garrod.Alwood at
Mon Feb 22 16:07:07 GMT 2010

You can upgrade to the newest version in ubuntu as well as soon Jules puts the deb packages I sent him. So keep an eye out for that if you like ubuntu.

Garrod Alwood
Open Source Consultant
Garrod.alwood at<mailto:Garrod.alwood at>
Sent from my iPod

On Feb 22, 2010, at 11:02 AM, "Gavin Silver" <GSilver at<mailto:GSilver at>> wrote:

Hey all,

Pulling my hair out over this. All of a sudden I am getting what looks like NDRs filling up my mail queue here is an example

Reporting-MTA: dns;
X-Postfix-Queue-ID: D882A4003DC
X-Postfix-Sender: rfc822; <mailto:laiaduye4777 at> laiaduye4777 at<mailto:laiaduye4777 at>
Arrival-Date: Mon, 22 Feb 2010 09:43:14 -0500 (EST)

Final-Recipient: rfc822; UNKNOWN_USER at
Original-Recipient: rfc822;UNKNOWN_USER at
Action: failed
Status: 5.1.1
Remote-MTA: dns;
Diagnostic-Code: smtp; 550 5.1.1 User unknown


MAILER-DAEMON at (Mail Delivery System)


laiaduye4777 at<mailto:laiaduye4777 at>


Mon, 22 Feb 2010 09:43:52 -0500 (EST)


Undelivered Mail Returned to Sender

This is the mail system at

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

< UNKNOWN_USER at >: host[client.server.ip.address] said: 550 5.1.1 User
    unknown (in reply to RCPT TO command)

My mailscanner is running in a gateway setup for multiple domains on ubuntu 8.04LTS / postfix
Mailscanenr version is 4.58.9 (*duck* I know! Im going to migrate everyone to a brand new updated version on centos very shortly.. :-/ )

I have smtp auth enabled in postfix according to documentation found on<>… so im not sure why my gateway is even sending bounces

Gavin Silver

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

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

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