email notification error

[nag ios]

Hi i'm totally new to nagios and i have installed nagios xi in linux machine
which was loaded with CENTOS 5.0
  i have configured it to send email notification when any service fails but
i'm not able to recieve the mail and getting the following error as mail
from mail deamon to my (root) mailbox

Please help me in figuring this out



>From MAILER-DAEMON at nagiostst.example.com  Tue Aug  2 17:49:51 2011
Return-Path: <MAILER-DAEMON at nagiostst.example.com>
Received: from localhost (localhost)
       by nagiostst.example.com (8.13.8/8.13.8) id p72CIRCQ030104;
       Tue, 2 Aug 2011 17:49:51 +0530
Date: Tue, 2 Aug 2011 17:49:51 +0530
From: Mail Delivery Subsystem <MAILER-DAEMON at nagiostst.example.com>
Message-Id: <201108021219.p72CIRCQ030104 at nagiostst.example.com>
To: <root at nagiostst.example.com>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
       boundary="p72CIRCQ030104.1312287591/nagiostst.example.com"
Subject: Warning: could not send message for past 4 hours
Auto-Submitted: auto-generated (warning-timeout)
Status: RO

This is a MIME-encapsulated message

--p72CIRCQ030104.1312287591/nagiostst.example.com

   **********************************************
   **      THIS IS A WARNING MESSAGE ONLY      **
   **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **


The original message was received at Tue, 2 Aug 2011 13:04:27 +0530
from nagiostst.example.com [127.0.0.1]

  ----- Transcript of session follows -----
<krishna.Nukala at infotech-enterprises.com>... Deferred: Connection timed out
with infotech-enterprises.com.
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

--p72CIRCQ030104.1312287591/nagiostst.example.com
Content-Type: message/delivery-status

Reporting-MTA: dns; nagiostst.example.com
Arrival-Date: Tue, 2 Aug 2011 13:04:27 +0530

Final-Recipient: RFC822; krishna.Nukala at infotech-enterprises.com
Action: delayed
Status: 4.4.1
Remote-MTA: DNS; infotech-enterprises.com
Last-Attempt-Date: Tue, 2 Aug 2011 17:49:51 +0530
Will-Retry-Until: Sun, 7 Aug 2011 13:04:27 +0530

--p72CIRCQ030104.1312287591/nagiostst.example.com
Content-Type: message/rfc822

Return-Path: <root at nagiostst.example.com>
Received: from nagiostst.example.com (nagiostst.example.com [127.0.0.1])
       by nagiostst.example.com (8.13.8/8.13.8) with ESMTP id p727YRkU008636
       for <krishna.Nukala at infotech-enterprises.com>; Tue, 2 Aug 2011
13:04:27 +0530
Received: (from apache at localhost)
       by nagiostst.example.com (8.13.8/8.13.8/Submit) id p727YR9x008635;
       Tue, 2 Aug 2011 13:04:27 +0530
X-Authentication-Warning: nagiostst.example.com: apache set sender to
root at nagiostst.example.com using -f
To: krishna.Nukala at infotech-enterprises.com
Subject: Nagios XI Email Test
Date: Tue, 2 Aug 2011 13:04:27 +0530
From: Nagios XI <root at nagiostst.example.com>
Reply-to: Nagios XI <root at nagiostst.example.com>
Message-ID: <fdf00e19882825ce5df097bc448696b6 at 172.16.83.82>
X-Priority: 3
X-Mailer: PHPMailer 5.1 (phpmailer.sourceforge.net)
MIME-Version: 1.0
Content-Type: multipart/alternative;
       boundary="b1_fdf00e19882825ce5df097bc448696b6"
--b1_fdf00e19882825ce5df097bc448696b6
Content-Type: text/plain; charset = "iso-8859-1"
Content-Transfer-Encoding: 8bit

This is a test email from Nagios XI


--b1_fdf00e19882825ce5df097bc448696b6
Content-Type: text/html; charset = "iso-8859-1"
Content-Transfer-Encoding: 8bit

This is a test email from Nagios XI



--b1_fdf00e19882825ce5df097bc448696b6--


--p72CIRCQ030104.1312287591/nagiostst.example.com--

>From krishna.nukala at infotech-enterprises.com  Tue Aug  2 14:10:19 2011
Return-Path: <krishna.nukala at infotech-enterprises.com>
Received: from corp.infotech-enterprises.com (nagiostst.example.com[127.0.0.1])
by nagiostst.example.com (8.13.8/8.13.8) with ESMTP id p727qVbP014105;
       Tue, 2 Aug 2011 13:25:11 +0530
Date: Tue, 2 Aug 2011 13:22:31 +0530
From: krishna.nukala at infotech-enterprises.com
Message-Id: <201108020755.p727qVbP014105 at nagiostst.example.com>
Status: RO

test mail
check it out

>From root at nagiostst.example.com  Tue Aug  2 07:00:12 2011
Return-Path: <root at nagiostst.example.com>
Received: from nagiostst.example.com (nagiostst.example.com [127.0.0.1])
       by nagiostst.example.com (8.13.8/8.13.8) with ESMTP id p721U4LC022775
       for <root at nagiostst.example.com>; Tue, 2 Aug 2011 07:00:12 +0530
Received: (from root at localhost)
       by nagiostst.example.com (8.13.8/8.13.8/Submit) id p721U4Tq022773;
       Tue, 2 Aug 2011 07:00:04 +0530
Date: Tue, 2 Aug 2011 07:00:04 +0530
Message-Id: <201108020130.p721U4Tq022773 at nagiostst.example.com>
From: root at nagiostst.example.com (Cron Daemon)
To: root at nagiostst.example.com
Subject: Cron <root at nagiostst> /root/scripts/automysqlbackup
Content-Type: text/plain; charset=UTF-8
Auto-Submitted: auto-generated
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=root>
X-Cron-Env: <USER=root>
Status: RO
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