Hello guys! Im very new in this kind of tasks so some help will be appreciated.

I find myself in a mysterious situation, because I have a machine with two distros one of them is RHEL 4.0 and the other is SLES 10 and the first one doesnt allow me to send emails. I have to say also I did no change in the config files in no machine, one of the was working fine out of the box and the other wasnt. I was checking the services (smtp and sendmail) and everything is up but when I try to perform a telnet to the port 25 I fail with Red hat but with Suse is ok. Im not using no firewall nor security.
I checked netstat and read sometimes different things, and I checked nmap as well and sometimes I see the port 25 with smtp in the list and sometimes i dont see it.

Do you know what could be causing this? dont know if it could be a missing package but the thing is that I checked the configuration files in some other machines in the same domain which I can send mails perfectly and I dont find the difference with this one. I have been working on this for days and Im running out of ideas!!!

Thanks for your time!!

Carlos.

Hi m8!

Default Sendmail config on RH is a little bit different from the one on *SUSE.
Try the following:

1. edit the /etc/mail/sendmail.mc file
2. Find this line:
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
3. Replace the localhost address with your IP
4. Now regenerate your sendmail.cf file the way you do it
(e.g. m4 /etc/mail/sendmail.mc > /etc/sendmail.cf)
5. killall -HUP sendmail

Let me know what's the outcome, buddy!

Fixed !! Thanks for your help Oozie! My problem was I never new I had to use "m4". I was modifying the sendmail.mc file and then just restarting the sendmail server but is this wasnt enough. It wasnt neccessary for me to change the ip but I couple of tweaks were neccesary to make the whole thing work.

To do the m4, is neccesary the package sendmail-cf(that was also missing in my machine). After that my system was complaining ´cause the files /etc/mail/local-host-names and /etc/mail/trusted-users were world writeable. To correct this open the file sendmail.cf and search for the lines Fw/etc/mail/local-host-name and change it to
Fw-o /etc/mail/local-host-names. Then search for the line Ft/etc/mail/trusted-users and change it to Fw-o /etc/mail/trusted/users.