From: Wietse Venema (wietseporcupine.org)
Date: Wed Nov 30 2005 - 06:31:17 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?

Wietse Venema wrote:
> The answer is in the maillog file.

Stephen Fung:
> The only error message I found in maillog is generated by postfix/smtpd
> as following:
>
> warning: premature end-of-input on public/cleanup socket while reading
> input attribute name

That is the error. The cleanup server aborts without receiving the mail.

        Wietse

http://www.postfix.org/DEBUG_README.html#logging

...

When Postfix does not receive or deliver mail, the first order of
business is to look for errors that prevent Postfix from working
properly:

% egrep '(warning|error|fatal|panic):' /some/log/file | more

Note: the most important message is near the BEGINNING of the
output.

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