Nagios smtp notifications
 

I'm running Nagios Core 3.2.3 in a CentOS 5.5 Server, i'm trying to set the notifications, however they don't go through. I'm Using Postfix, i also setup squirrel mail and i can send mails through it successfully, can anyone give me some advice about the logs to check or configurations to check?

/var/log/maillog would be your first port of call, I'd imagine.

Sorry for the delay but i couldn't access the server in a few days.
Thanks for the quick response arashi256, i checked the logs and after noting that I didn't need Dovecot or Squirrelmail i deleted both. Now what i need to do is to be able to send emails configuring Postfix correctly. I've found some on the web but all of them use some sort of security and i don't need that right now, i just need Nagios to be able to send the notifications to other recipients on the domain.
I can send mails through the terminal by typing these easy steps:
#telnet 192.168.1.1 25
ehlo localhost
mail from: <test@mail.org>
rcpt to: <address@mail.org>
Data

quit

I think i'm missing some of the configuration steps in either Postfix or Nagios, anyone willing to help?