Setting up SMTP?

[James McKenzie]

Shane Presley wrote:

>Hello,
>
>I just installed Fedora, and installed Big Brother for network
>monitoring.  This is my first time setting up linux, so sorry for a
>newbie question.
>
>I need the server to have SMTP running, so that users in our network
>can send e-mails to the server, which will fire off a script to deal
>with the e-mail.  For example an admin wants to acknowledge an alert,
>he sends mail to bb at mylinuxbox.mydomain.com.
>
>Initially SMTP wasn't running on my box.  So I just ran
>/etc/rc3.d/S80sendmail start.  Okay now sendmail appears to be
>running.  ps -aef | grep sendmail shows
>
>root      1725     1  0 Oct25 ?        00:00:00 sendmail: accepting connections
>smmsp     1734     1  0 Oct25 ?        00:00:00 sendmail: Queue
>runner at 01:00:00 for /var/spool/clientmqueue
>
>But if I telnet to port 25 on my system, I get connection refused. 
>There is no firewall.
>
>I assume I need to change something in my sendmail config?  I read the
>Red Hat Linux Reference Guide and I couldn't really figure out what I
>need to change.  I was a little concerned about this section:
>
>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
>
>  
>
Change this to:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl  (note the first character that 
appears to be a quote is a grave accent which is the unshifted tilde key)
After saving the file, type in:
make -C /etc/mail

This will rebuild the sendmail.cf file.
BTW, this is at the top of the sendmail.mc file and was confirmed by my 
local *NIX guru.

>But I'm not sure if I should comment that out. Also I tried to build a
>new sendmail.cf file and got this error:
>
>m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
>/etc/mail/sendmail.mc:10: m4: Cannot open
>/usr/share/sendmail-cf/m4/cf.m4: No such file or directory
>
>  
>
This is correct.  The m4 program cannot rebuild the mail files.

James McKenzie