CentOS - Aug 2005 - sendmail refusing incoming connections from outside

Hello.

I am scratching my head about sendmail for a simple thing:

I have a CentOS 4 box on which I would like to receive e-mails.
when I type 'telnet localhost 25' I can connect successfully to the
sendmail
service.
Now if I type: 'telnet 192.168.0.30 25' on the same host the connection
is
refused.
It also refuses connections from another host.

I have edited the /etc/mail/access file and added:
192.168        OK
But this doesn't help after a restart.

Does somebody know why the connection is refused ? I can see that behaviour 
on several CentOS box I have so it seems to be the new default. What 
parameter should I change to make it be accepted ?

Thank you,
Daniel

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On 8/5/05, dan1 <dan1 at edenpics.com> wrote:
> It also refuses connections from another host. 
>   
> I have edited the /etc/mail/access file and added: 
> 192.168        OK 
> But this doesn't help after a restart. 
>   
> Does somebody know why the connection is refused ? I can see that behaviour
> on several CentOS box I have so it seems to be the new default. What
> parameter should I change to make it be accepted ? 
You will need to edit /etc/mail/sendmail.mc and regenerate a new sendmail.cf
Edit and add a line similar to below for your network:
DAEMON_OPTIONS(`Port=smtp,Addr=90.0.0.2, Name=MTA')dnl

Generate new cf file by running macro:
#m4 /etc/mail/sendmail.mc > /etc/sendmail.cf

Restart sendmail and you should be good.
HTH
-- 
Sudev Barar
Learning Linux

On 05/08/05, dan1 <dan1 at edenpics.com> wrote:
> Hello.
>  
> I am scratching my head about sendmail for a simple thing:
>  
> I have a CentOS 4 box on which I would like to receive e-mails.
> when I type 'telnet localhost 25' I can connect successfully to the
sendmail
> service.
> Now if I type: 'telnet 192.168.0.30 25' on the same host the
connection is
> refused.
> It also refuses connections from another host.
>  
> I have edited the /etc/mail/access file and added:
> 192.168        OK
> But this doesn't help after a restart.
>  
> Does somebody know why the connection is refused ? I can see that behaviour
> on several CentOS box I have so it seems to be the new default. What
> parameter should I change to make it be accepted ?
https://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/ref-guide/s1-email-mta.html
--------------
Important 
The default sendmail.cf file does not allow Sendmail to accept network
connections from any host other than the local computer. To configure
Sendmail as a server for other clients, edit the /etc/mail/sendmail.mc
file, and either change the address specified in the Addr= option of
the DAEMON_OPTIONS directive from 127.0.0.1 to the IP address of an
active network device or comment out the DAEMON_OPTIONS directive all
together by placing dnl at the beginning of the line. When finished,
regenerate /etc/mail/sendmail.cf by executing the following command:

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
--------------

Will.