North American Network Operators Group
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Re: Fun new policy at AOL

  • From: Matthew Crocker
  • Date: Thu Aug 28 10:20:08 2003 


In article <[email protected]>, Richard Cox
<[email protected]> writes



We can thank the usual suspects - Cogent, Qwest, AT&T, Comcast - and
in

Europe: BT, NTL and possibly the world-abuse-leader, Deutsche Telekom

(who run dtag.de and t-dialin.net) for this being the situation.



Here's another tale of undeliverable email. It seems that [at least]
one

of those organisations you mention assigns IP addresses for its ADSL

customers from the same blocks as dial-up. Which means that

organisations using MAPS-DUL reject email from teleworkers (or indeed

people running businesses with an ADSL connection) who run their own

SMTP servers.

--

Roland Perry







Shouldn't customers that purchase IP services from an ISP use the ISPs
mail server as a smart host for outbound mail? We block outbound port
25 connections on our dialup and DSL pool. We ask our customers that
have their own mail servers to configure them to forward through our
mail servers. We get SPAM/abuse notifications that way and can kick
the customer off the network. We also block inbound port 25
connections unless they are coming from our mail server and require the
customer setup their MX record to forward through our mail server. We
virus scan all mail coming and going that way. We protect our
customers from the network and our network from our customers. We are
currently blocking over 3k Sobigs/hour on our mail servers. I would
rather have that then all my bandwidth eaten up by Sobig on all of my
dialup/DSL connections.



SMTP & DNS should be run through the servers provided by the ISP for
the exact purpose. There is no valid reason for a dialup customer to
go direct to root-servers.net and there is no reason why a dialup user
should be sending mail directly to AOL, or any mail server for that
matter (besides their host ISP)



-Matt