Nagios Notifications - localhost.localdomain

[nagios-list at panazone.net]

I was able to get Nagios 1.2 up and running on a Red Hat Linux 8.0 box without 
asking any questions, but I just can't figure this one out.  More than likely 
it is my lack of knowledge of sendmail, but hopefully someone can help out.

I initially setup Nagios 1.2 on a Red Hat 8.0 system at home.  I then 
installed it on a spare laptop from work using the exact same steps and .cfg 
files (I literally copied them from the RH8.0 desktop to the RH8.0 laptop).  I 
took that laptop to work with me and connected it to the corporate network 
(which is what I want to monitor).  What I've found is that on the laptop it 
sends the notifications from nagios at localhost.localdomain, but from the 
original system at home they originate from nagios at VMLINUXRH8.WMNET.local 
(VMLINUXRH8 is the hostname and WMNET.local is the domain). They both have the 
exact same version of Red Hat, sendmail, & Nagios.

What is it that determines which domain is appended to the username?  I 
checked through all my network configuration settings, the nagios config 
files, and also the sendmail config files (sendmail.mc, etc).  I even tried 
using masquerading to change the appended domain name to no avail.

Any tips or info would be highly appreciated.  I know it is rather a minor 
issue, but I will be testing Nagios in a very large enterprise environment and 
want to give it all the credibility I can.  

BTW, Nagios is being setup alongside a multi-million dollar monitoring system 
(HP OpenView, HP NNM, Concord eHealth, etc.) that hasn't worked worth beans in 
over a year due to bad project management.  I'd like to show them what an open 
source, free product can do in a few weeks.

Thanks!


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