Switching SMTP "on"

[Alexey Fadyushin]

I assume that you are using Sendmail as the SMTP server.
In the default configuration sendmail does not listen for connections
fron other machines. To enable listening for SMTP connections from
everywhere you should comment out od delete the 'DAEMON OPTIONS' line in
the
file /etc/mail/sendmail.mc. To comment it out you should place word dnl
at the beginning of the line, not the usual symbol #.

Then create new sendmail configuration file from the modified .mc file:
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

And, finally, restart sendmail:
service sendmail restart

Alexey Fadyushin.
Brainbench MVP for Linux.
http://www.brainbench.com


kenwardc wrote:
> 
> Hi Folks
> 
> I'm new to Linux and must admit I keep on stumbling at the differences
> in the way the OS does things compared to W*nd*ws.
> 
> Have just set up two mail servers and everything looks OK. Using RHN
> RedHat Enterprise Linux 3+ complete with nice graphical GNOME
> interface etc.
> 
> Problem is that although I can telnet to port 25 on BOTH servers from
> the local console using "telnet localhost 25" (they both answer on
> that port) I CANNOT telnet to the server using port 25 from outside on
> the Internet.
> 
> Now... before you ask... ;)
> 
> 1. No firewall on the local machine - switched OFF.
> 
> 2. Hardware firewall at both places (each server is in a different
>    computer room) allowing TCP 25 and NAT redirection to servers OK.
> 
> 3. Firewall logs show PERMIT for all port 25 transactions so I don't
>    think it's firewall related.
> 
> 4. Both server updated using up2date to all latest patches etc.
> 
> 5. /etc/services file shows listening on port 25. Well that's OK
> anyway
>    because we already telnetted in OK from localhost.
> 
> So.. is there some sort of "switch" somewhere that tells the server
> that SMPTD should listen and allow connections from OUTSIDE the
> localhost? Any help mucho appreciated!
> 
> Regards
> Chris
> 
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