Sendmail listening on localhost.localdomain

[Harris Ruan]

I have sendmail running on Redhat 7.3 but it seems that it only listens on localhost.locadomain.
netstat -a | grep smtp
tcp        0      0 localhost.localdom:smtp *:*                    LISTEN

So I can do "telnet localhost 25"

but not "telnet [ip address] 25"

Any ideas to make sendmail to listen on my ip? 
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