From: Stephen Fung (stephenhknet.com)
Date: Wed Nov 30 2005 - 02:03:52 CST

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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

Wietse Venema wrote:
> 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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