Sendmail and Relay List

From: many Lists.. (many_lists@yahoo.com)
Date: 07/30/02 

Date: Tue, 30 Jul 2002 11:20:30 -0700 (PDT)
From: "many Lists.." <many_lists@yahoo.com>
To: security-discuss@linuxsecurity.com

I am pentesting a box.

This is sendmail result below:

Trying xxx.xxx.xxx.xxx ...
Connected to xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx).
Escape character is '^]'.
220 xxx.xxx.xxx.xxx ESMTP Sendmail 8.9.3/8.9.3; Tue,
30 Jul 2002 13:03:07
-0400

It is not an open relay thats why i can send email
only to those domains which are added as relays. I
guessed a few domains hosted on that very box by
searching on netcraft but is there a way to find out
list of allowed Relays? if any ip exists in it then
maybe i can try relaying from that I.P address ?
just want to know the list of domains added there as
RELAYS. any possible way?

or does anyone have it's working exploit or
vulnerability details for that specific version?
                  

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