Sendmail 8.9.3 RELAY List

["many Lists.." <many_lists () yahoo 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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