I run Nagios Core 3.2.3 and running postfix as mt mta agent in Ubuntu 10.4.

I have setup nagios alerts to send to me and to send to our ticketing system which is ticket@csaa.com.

My ticketing system has a auto responder which responds to end users so with that basically whenever Nagios sends alerts to ticket@csaa.com it auto responds to nagios - unfortunately it fails:

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The mail system
<nagios@monitor22.csaa.local>: Host or domain name not found. Name service error for name=monitor22.csaa.local type=A: Host not found

My question is, how can I make Nagios/Postfix receive emails within?

Pls kindly advise mates.
Cheers,
DB

- Make sure your Postfix works first (using Telnet)
- Post the detailed steps and related configuration files?
- Have a look at the Nagios log.

Im getting access denied when testing postfix:
root:~# telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
ehlo csaa.com
250-monitor22.csaa.local
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
mail from: admin@csaa.com
250 2.1.0 Ok
rcpt to: administratoremail@csaa.com
Relay access denied

Take a look at some parameters such as: mydestination, smtpd_recipient_restrictions, relay_domains, ... on the Postfix documentation.