New way of spam?

Gerard gerard at
Thu May 15 13:57:33 IST 2008

On Wed, 14 May 2008 14:18:57 -0300
"Juan Pablo Lorier" <jplorier at> wrote:

> It's the second time in a month that a user get bombarded with tons
> of spam comming from bouncings. They put the users mail account in
> the From so when the mail server replies that the user doesn't exist
> it get to the real user account. As the sending server is legal, the
> mails get trough mailscanner.

This is commonly known as 'backscatter'. It is not really anything new.
What MTA are you employing. If it is a Postfix setup, you can block
backscatter before it is ever accepted, which is a preferable method of
handling this phenomenon.

gerard at

Language is a virus from another planet.

	William Burroughs
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