I am running sbs server2k with exchange 2k.  My exchange is acting funny.  
Heres how.

People out side my server(yahoo, aol)are recieveing
E-mail from my exchange server.  The funny thing is that the people who send
the e-mail are non existing on my server.  I called microsoft and they told
me to look at my relay.  It may be open.  When I went to the smtp properties
in the exchange manager and cliked on relay it had the option of only listed
below and granted acccess to, it had my server local ip address.  Does this
mean my relay is open.  Pleas help.

Most appreciative,