backscatter / ndr / smtp auth issues

[Gavin Silver]

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; MY_MAILSCANNER_GATEWAY.net
X-Postfix-Queue-ID: D882A4003DC
X-Postfix-Sender: rfc822; laiaduye4777 at telemar.net.br
Arrival-Date: Mon, 22 Feb 2010 09:43:14 -0500 (EST)

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

From

MAILER-DAEMON at MY_MAILSCANNER_GATEWAY.net (Mail Delivery System)

To

laiaduye4777 at telemar.net.br

Date

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

Subject

Undelivered Mail Returned to Sender



This is the mail system at MY_MAILSCANNER_GATEWAY.net.

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 MY_CLIENTS_DOMAIN.com >: host MY_CLIENTS_MAILSERVER.com[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 mailscanner.info... so im not sure why my gateway is even sending bounces













----------------------------------
Gavin Silver


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