North American Network Operators Group

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RE: SMTP authentication for broadband providers

  • From: Alexander Kiwerski
  • Date: Thu Feb 12 15:48:20 2004

Well, over here we have gone that route, and we're a National ISP/NSP.

Customers can either A) Run their own mail servers, which makes them
responsible for the use (or abuse) of their own mail server, or,
B) If they choose to purchase mail services from us, we require
authentication (via SMTP_AUTH) to send/relay out.

Alexander Kiwerski
Senior Network Engineer
Winstar-IDT Network Operations & Security
Desk: +1 206 574 3121
Mobile: +1 206 571 0274

-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of
Dan Ellis
Sent: Thursday, February 12, 2004 11:31 AM
To: [email protected]
Subject: RE: SMTP authentication for broadband providers

First, a quick thanks to everyone that responded.  I've received useful and
excellent info from everyone.

We do not block on 25 outbound/inbound, but we are considering it for the
residential broadband connections - maybe filter, proxy, or at least monitor

I should clarify one thing:  We are considering REQUIRING SMTPAUTH for all
connections from customers for relaying - whether they are on our IP space
or not.  I know this will only buy us a few months until the next round of
viruses steal username/pass, but even then it will give us the ability to
detect an infected/SPAMMING customer quicker and auto shut them down (vs
having to shutdown the IP, and then the customer receives a new IP...)

My question is: Have any or many of the larger ISP's gone the route of
REQUIRING all customers to use SMTPAUTH - regardless of where they are
connected.  Can anyone disclose who these regional or national providers

Thanks again

Daniel Ellis,�CTO, PenTeleData

> qmail (as usual).