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Re: SMTP in distributed DOS
- From: I Am Not An Isp
- Date: Sun Feb 20 15:30:37 2000
At 11:04 AM 2/20/00 -0800, Dirk Harms-Merbitz wrote:
>We are currently seeing this first hand: Our real mail.power.net is
>at 18.104.22.168. The attacker is sending individualized emails with
>faked headers that contain "mail.power.net (unverified [22.214.171.124])".
>The recipient computers are dumb enough to send their bounces to
>the real mail.power.net.
This is the problem - a mail server stupid enough to send a bounce to an
unverified host name, instead of the connecting IP address.
>This is a DOS because the innocent mail server a) gets millions of
>bounces and b) might get black listed on various "anti-spam" lists.
What anti-spam list maintainer would add an unverified host name in a
header? Especially when the IP address does not match the hostname?
I Am Not An Isp - www.ianai.net
ISPF, The Forum for ISPs by ISPs, <http://www.ispf.com>
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