Backscatter & challenge response

[Kevin MURPHY]

Hi there,

Sorry for jumping in on this - but wondered how you went about
watermarking? I use Sendmail / MS

Regards

> Hi
>
> In common with lots of people I've seen a massive increase in the amount
> of
> backscatter my domains are getting. I implemented watermarking which has
> helped a great deal.
>
> What I'm getting complaints about now are the mails coming in from
> annoying
> challenge response systems, the mails don't come from postmaster, <>
> etc...
> so the watermark does not get looked at.
>
> Just wondered if anyone had any bright ideals as to how to combat it?
>
> I've been looking at a selection I've been sent through this morning and
> there doesn't seem to be anything consistent about them and there not
> hitting many spamassasin rules.
>
> Cheers
>
> Paul
>
>
>
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