Will Watermarking Stop Backscatter?

Tom G. Christensen tgc at statsbiblioteket.dk
Tue May 13 13:52:13 IST 2008

Jason Ede wrote:
> ________________________________________
> From: mailscanner-bounces at lists.mailscanner.info [mailscanner-bounces at lists.mailscanner.info] On Behalf Of Tom G. Christensen [tgc at statsbiblioteket.dk]
> Sent: 13 May 2008 12:41
> 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
> Why not just give that user authenticated outgoing smtp?
Let's say for arguments sake that this is not an option.

My guess would be that example.com rejects the bounce but I'd like a 
second opinion.


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