Philip Hazel wrote:
> (a) It will fail any HELO command that is too long for its command buffer,
> which is 512 bytes long (as recommended by RFC 821).
>
> (b) Whatever the length of the HELO string, it won't stop the IP address
> appearing in the Received line.
>
> > 2. Is it possible to write a system filter that will fail messages with
> > incorrect Received: headers?
>
> Not easy. It is not straightforward to define what you mean by an
> "incorrect" received header.
I understand the problem. However there is a perl script "adcomplain.pl"
that does check Received: headers and finds most of spammer's tricks. I
looked at the perl code that does it and I don't think it is easy to
translate it to exim filter language however...
avk
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