Re: Dealing with s-p-a-m "backscatter"

[Ian McDonald <iam () ST-ANDREWS AC UK>]

> > Has anyone come up with a more creative way to block the spam
> > backscatter while allowing the legit non-delivery SMTP notifications to
> > come through?


MailScanner can add a watermark to each outgoing message (derived from a
secret you configure), so that they appear in legitimate notifications.
It can hence bin non-legit ones inbound :) .

http://www.mailscanner.info/MailScanner.conf.index.html#Add%20Watermark

I presume similar functionality is available in other packages, but I
noticed it in MailScanner.

HTH

--
ian