backscatter / ndr / smtp auth issues

Gavin Silver GSilver at
Mon Feb 22 18:41:27 GMT 2010

That server is not my mailscanner but shouldn't mailscanner not accept the message in the first place to relay onto my clients domain if the user doesn't exist (smtp auth)

Gavin Silver

-----Original Message-----
From: mailscanner-bounces at [mailto:mailscanner-bounces at] On Behalf Of Kai Schaetzl
Sent: Monday, February 22, 2010 11:55 AM
To: mailscanner at
Subject: Re: backscatter / ndr / smtp auth issues

Gavin Silver wrote on Mon, 22 Feb 2010 10:59:42 -0500:

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

that system is probably not your mailscanner server and thus rejects the 
non-deliverable mail to your mailscanner server. Not?


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