sendmail

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I know I am probably missing something obvious, but I am having trouble setting up a sendmail server on rh 8.0.  I have the server set up and configured, and sendmail is running in daemon mode.  However, whenever a system tries to attach to port 25 of my machine it gets a "connection refused."  If I try to attach to port 25 of "localhost" it does work, but if it doesn't work if I try to attach to my real IP address from the host itself or any other hosts.  It seems to me that there is something preventing external connections to port 25, but I can't figure out what's doing it.
 
Thanks,
Sam

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