Re: OT: Attn Thor
- From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Fri, 17 Jun 2005 14:00:58 -0700
And when the next virus uses your e-mail address as the forged from address,
the IP that all of those "challenges" come from will be correctly flagged as
sending out spam. Additionally there is already a concept virus that will
actually respond to those challenges, although no virus yet has used it.
Or how about this DOS attack that has already happened: A Black Hat sends
out thousands and thousands of messages with a single forged from address to
a system that uses C/R such as Earthlink. That system then bombards that
forged from address with thousands of C/R messages. Yes, this has already
happened.
Have you ever seen what happens when both sender and recipient are on C/R
systems? It creates an endless loop of one server challenging the other.
C/R systems are known to create problems with auto notices, such as those
from airlines and on-line retailers.
Remember people, if the war on spam were that easy to win, it would have
been over already.
John T
eServices For You
> -----Original Message-----
> From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx]
> Sent: Friday, June 17, 2005 12:59 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: OT: Attn Thor
>
> http://www.ISAserver.org
>
> They don't add to *my* spam problem. Why exactly do you think it is a
poor
> choice? I get over 2000 spam emails *per day,* just to my address, and
> that is the low end. While I can see the 2000 emails generate 2000
> responses to invalid addresses that never get answered, (not to mention
the
> NDR) and that it is more traffic that must be handled, the end result to
me
> is that I can actually continue to use my Thor address.
>
> The real problem is free email services, open SMTP relays, and moron users
> who get infected with SMTP Trojans. While my solution is not necessarily
> magnanimous, it is manageable for me.
>
> t
>
>
>
>
> ----- Original Message -----
> From: "John Tolmachoff (Lists)" <johnlist@xxxxxxxxxxxxxxxxxxx>
> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> Sent: Friday, June 17, 2005 12:22 PM
> Subject: [isalist] Re: OT: Attn Thor
>
>
> http://www.ISAserver.org
>
> Your e-mail service. Sending you an e-mail results in a challenge/response
> message requesting verification of the sending e-mail address.
>
> Challenge/response e-mail configurations are poor choice and actually add
to
> the spam problem.
>
> I do not respond to challenge/response requests.
>
> John T
> eServices For You
>
> > -----Original Message-----
> > From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx]
> > Sent: Thursday, June 16, 2005 1:38 PM
> > To: [ISAserver.org Discussion List]
> > Subject: [isalist] Re: OT: Attn Thor
> >
> > http://www.ISAserver.org
> >
> > Huh?
> >
> > ----- Original Message -----
> > From: "John Tolmachoff (Lists)" <johnlist@xxxxxxxxxxxxxxxxxxx>
> > To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> > Sent: Thursday, June 16, 2005 1:02 PM
> > Subject: [isalist] OT: Attn Thor
> >
> >
> > > http://www.ISAserver.org
> > >
> > > Bad Challenge/Response, Bad.
> > >
> > > John T
> > > eServices For You
> > >
> > >
> > >
> > >
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