On Mon, 16 Feb 1998, Alan Thew wrote:
> As others may have seen, the "new generation" of spam software does direct
> injection to our/your MTA, no smarthost/3rd part relay etc.
>
> In some cases, the best thing is to just block IP address ranges etc.
> However all attacks seen here so far have blank To: and From: fields. I'm
> still running 1.73 and wondered what the easiest way to trap this.
System filter:
if $h_to is "" and $h_from is "" then .....
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