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Your best option is to setup ipchains to open port 25 from my understanding. I've never messed with setting up a mail server personally so I couldn't tell you how exactly how to do it. But from what I have read or seen so far, ipchains or setting up your firewall rules is the best way I would presume.
My /etc/mail/sendmail.mc setting is show below, what is wrong?
dnl This changes sendmail to only listen on the loopback device 127.0.0.1
dnl and not on any other network devices. Comment this out if you want
dnl to accept email over the network.
dnl NOTE: binding both IPv4 and IPv6 daemon to the same port requires
dnl a kernel patch
dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')
dnl We strongly recommend to comment this one out if you want to protect
dnl yourself from spam. However, the laptop and users on computers that do
dnl not have 24x7 DNS do need this.
The questions is do I need add this code to it then the sendmail then will open the SMTP port to received the outside's e-mail?