From: Wietse Venema (wietseporcupine.org)
Date: Tue Nov 29 2005 - 21:12:21 CST

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Stephen Fung:
> Hi,
>
> Recently our postfix servers generated the following error while
> receiving some junk mails from outside. We found that there is a strange
> header line with 8-bit characters which seems to be the problem source.
>
> The problem is, the return code of this error is 451 instead of 5xx,
> which caused the peer to keep on trying. How can we configure postfix to
> return a 5xx return code to the peer instead of 451? By means of header
> check or some other parameters?

The answer is in the maillog file.

        Wietse

> Below is the error message sent to postmaster of our postfix server:

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