[CLUE-Tech] Mail Delivery (failure clue-tech@clue.denver.co.us)

[Collins Richey]

On Thu, 08 Jul 2004 15:10:53 -0600
Charles Oriez <coriez at oriez.org> wrote:


> At 02:26 PM 7/8/2004 -0600, Jed S. Baer wrote:
> >On Thu, 8 Jul 2004 14:54:22 -0400
> >"Roy J. Tellason" <rtellason at blazenet.net> wrote:
> >

> >Actually, a couple weeks ago, there was news going around about
> >Comcast actually blocking SMTP from infected machines. (Or maybe it
> >wasn't quite that drastic?)
> 
> yep. they blocked port 25 on any client machine sending out abnormally
> high volumes of email.  I had their dynamic space blocked for awhile,
> and I think I still do.  At one point, it was accounting for 25% of my
> spam blocks on a week to week basis.  There has since been a dramatic
> drop. I'm not the only one seeing it, but in my case I would say that
> the drop has been in the 90% plus range.
> 
> For any comcast customer who is suddenly finding legit traffic to be 
> blocked, they need to point their outbound mail thru smtp.comcast.net
> which routes it through 1 of about 4 or so servers.  However, the
> server ID that hits your server does not always identify itself as
> smtp.comcast.net.  Best solution is to use comcast.blackholes.us as a
> dnsbl, then whitelist their legit smtp servers in your access.db with
> the following entries:
> 
> connect:smtp.comcast.net        OK
> connect:rwcrmhc11.comcast.net   OK
> connect:sccrmhc11.comcast.net   OK
> connect:sccrmhc12.comcast.net   OK
> connect:sccrmhc13.comcast.net   OK
> 
> another workable alternative appears to be to blacklist
> 
> .client.comcast.net     REJECT
> 
> So far, everything I bounce coming from their trojaned machines has
> that pattern
> 

Unfortunately, most isp's and list moderators who choose to block
comcast aren't quite this intelligent. They just block the entire
comcast ip address range, and to hell with legitimate users.

My attitude is this: if they block messages from me, I don't need them
anyway; there's more than one fish in the sea. I'm on lots of lists and
have received no complaints, and I certainly have no complaints about
comcast service.

-- 
 /\/\
( CR ) Collins Richey
 \/\/