Re: e-postage stamps, was Welcome to the new(ish) ASRG list

----- Original Message -----
> From: "Roger B.A. Klorese" <[email protected]>
> To: [email protected]
> Sent: Saturday, March 16, 2013 10:46:30 PM
> Subject: Re: e-postage stamps, was Welcome to the new(ish) ASRG list
> 
> On 3/16/13 10:42 PM, Rob McEwen wrote:
> > On 3/17/2013 1:09 AM, Franck Martin wrote:
> >> I'm all for outright blocking on no rDNS but who are these large
> >> ISPs?
> > I don't have a list off the top of my head... but I did have a
> > friend
> > who is an IT guy at a company and where the made some changes to
> > their
> > firewall just two weeks ago... which mistakenly caused their
> > exchange
> > server's outbound IP to switch to an IP that didn't have rDNS.
> > Immediately, there were massive numbers of outbound messages
> > blocked
> > across many recipients, including some large ISPs. I didn't make a
> > list,
> > but he said, "we're being blocked by this and that"... and I recall
> > hearing some "household names". (Also, this wasn't totally
> > scientific
> > since you could argue that their IP being "new" might have factored
> > into
> > the mix... but they were NOT sending ANY spam at that time!)
> >
> > Also, I recall a person high up at Cox Communications saying that
> > they
> > block on "no rDNS", fwiw.
> >
> 
> Yahoo, AOL, Cox, and Comcast all block on the combination of any
> significant volume and no rDNS.
> 

From that list I know that Yahoo and AOL do not outright block if there is no rDNS and only Comcast does. I don't know about Cox.

So once again who are these Many ISPs that outright block on no rDNS?