Will Watermarking Stop Backscatter?

[Koopmann, Jan-Peter]

> Stupid question perhaps, but how will it handle this case:
> example.com enables watermarking using MailScanner
> userA has emailaddress userA at example.com

> When he sends mail from home he uses his ISP smarthost and not the
> mailsystem at example.com

Bad idea.

> What happens when mail sent this way is bounced somewhere on the way?

The bounce will be rejected by the MailScanner system of example.com.

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

Correct.