Re: Qmail and Bounce Message Spamming

["Matthew R. Dempsky" <mrd@alkemio.org>]

On Sun, Apr 01, 2007 at 08:33:57PM -0700, Scott Dudley wrote:
> I'm troubled Charles because these messages are not bounced messages 
> originated from this qmail server.  Instead, they originate elsewhere 
> with the deliberate attempt of exploiting this functionality to SPAM.  I 
> found several posts describing this very issue yesterday.

If receiving bounce messages concern you so much, add a blank line to
/var/qmail/control/badmailfrom.  However, realize that in doing so
you're blocking legitimate bounce messages notifying you of message
delivery failures.

A more cynical suggestion would be to block incoming TCP connections
on port 25 because there are deliberate attempts of exploiting that
functionality for spam as well.