Spamhaus...

Larry Sheldon LarrySheldon at cox.net
Sat Feb 20 20:29:10 CST 2010


On 2/20/2010 4:57 PM, James Hess wrote:

For the purpose of the following two paragraphs, pretend for the moment
that you operate a business selling stuff via an email address
Sales at Example.Com.  For dramatic effect, assume your children will
starve if you are not able to sell anything.

Further, pretend that you have really annoyed somebody--a competitor,
perhaps.  Suppose that your competitor has contracted with a real,
genuine spammer to send email mmessages advertizing some trash at a rate
of tens of thousands per second until the bot-net gets shut down   using
Sales at Example.Com as the Return-Path.

Now.  Read the two paragraphs.

> Spurious DSNs  are less harmful than missing DSNs.  Spurious DSNs can
> be discarded easily by the mail server that knows it didn't pass that
> message.    DSNs that were not generated cannot be recovered.
> 
> Discarding is currently the responsibility of the mail server whose
> address has been forged.  Just like it's the responsibility of a host
> whose source address was forged in a TCP transaction, to  discard  the
> "ACK"  packet for a connection that resulted from a spoofed SYN.

Anything about those two 'graphs you would like to reconsider?


And by the way, when I was running a network, if I got very many errant
SYN's from a particular source, that source would get a static route to
a 500 ohm resistor.

> The mail server sending DSN for the fake message, or replying to a
> spoofed SYN is  not a spammer in any way,   they are actually a victim
>  wasting their own bandwidth  responding to a bogus message.  

Victim they may be, spammer they are,  The definition of "spammer" does
not include a "get even with the world" or "do unto others as was done
unto you" clauses.

-- 
"Government big enough to supply everything you need is big enough to
take everything you have."

Remember:  The Ark was built by amateurs, the Titanic by professionals.

Requiescas in pace o email
Ex turpi causa non oritur actio
Eppure si rinfresca

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