close open relay

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hi all, running centos 4.7 i686.

I seem to have an o pen  r elay sendmail server.
How do I close it?

I have the STRAIGHT centos install sendmail.mc file.
Only thing I changed was:
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl

so as to allow incoming email and not just localhost. however this seems to relay everyone.

I looked at http://www.sendmail.org/tips/relaying but it just talks about (AFIKT)
enabling specific relays to occur - not how to CLOSE the relaying.

How do I close the relay?

Jerry
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