North American Network Operators Group

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RE: SMTP Port Blocking: Success or Failure?

  • From: Paul Ryan
  • Date: Mon Feb 28 16:28:25 2005

How effective is rate limiting - can anyone from Comcast reaply to me
offlist, I would be very intersted in results ...


-----Original Message-----
From: []On Behalf Of
John Levine
Sent: Sunday, February 27, 2005 11:20 AM
Subject: Re: SMTP Port Blocking: Success or Failure?

>What about rate limiting SMTP traffic rather than blocking it? That
>could allow legitimate use for most private customers, while
>preventing bulk traffic.

Comcast has been doing something like that, looking for spikes of SMTP
connects and blocking when they see them, done at the IP level.  I
can't say that I'm overly impressed with how well it's working, but
it's better than nothing.

John Levine,, Primary Perpetrator of "The Internet for
Information Superhighwayman wanna-be,, Mayor
"I dropped the toothpaste", said Tom, crestfallenly.