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Edit /etc/mail/sendmail.mc and comment out the line (add a leading 'dnl'):
dnl # The following causes sendmail to only listen on the IPv4 loopback address
dnl # 127.0.0.1 and not on any other network devices. Remove the loopback
dnl # address restriction to accept email from the internet or intranet.
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
I seem to recall that this didn't used to be the default, but I'm not sure. That may explain your confusion.
Yes, dnl "comments it out". The real answer is that it tells the macro processor to delete the rest of the line. Same thing to you and me. And the trailing 'd' in my earlier post is just a paste error. Please ignore.
But, as I re-read this I think I've misled you. Later versions of sendmail have changed the layout of some of the config files - check out /etc/mail/access. It looks like relaying IS turned off, except for localhost by default.
You're confusing me as you never answered the previous question. Is the 192.168 IP address an example or are you really using it?? If you're really using it, then that's your problem. You need to use the actual IP assigned by the ISP. I'm also assuming you have port 25 open on your firewall?