Will Watermarking Stop Backscatter?

Tom G. Christensen tgc at statsbiblioteket.dk
Tue May 13 14:10:42 IST 2008

Martin.Hepworth wrote:
> Tom
> It won't and if you use SPF it will give a spam result as well.
I assume what you're saying is that example.com won't accept the bounce, 
that is pretty much what I expected.

> Email 'should' flow the SMTP gateway for that domain.
Yes I suppose. Damn spammers :(


>> -----Original Message-----
>> From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner-
>> bounces at lists.mailscanner.info] On Behalf Of Tom G. Christensen
>> Sent: 13 May 2008 12:42
>> To: MailScanner discussion
>> Subject: Re: Will Watermarking Stop Backscatter?
>> Koopmann, Jan-Peter wrote:
>>> To answer Daniel's original question: Yes, watermarking should stop most
>>> (if not all) backscatter that is out there. There are commercial
>>> programs out there as well (e.g. BarricadeMX) that use a very nifty
>>> E-Mail watermarking system as well. Give them a try. It is worth it.
>> Stupid question perhaps, but how will it handle this case:
>> example.com enables watermarking using MailScanner
>> userA has emailaddress userA at example.com
>> On his homepc he configures his mail program to use userA at example.com as
>> the From adress.
>> When he sends mail from home he uses his ISP smarthost and not the
>> mailsystem at example.com
>> What happens when mail sent this way is bounced somewhere on the way?
>> -tgc

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