backscatter / ndr / smtp auth issues

[Kai Schaetzl]

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

> < 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)

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

Kai

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