not able to send mails from linux

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Operating Systems Linux Red Hat not able to send mails from linux
# 1  
not able to send mails from linux

I am using centOS 5.3 as server, and i hav installed sendmail-8.13.8-2.el5.i386.
But still, m not able to send mails to outer domain. Do i need to configure DNS for this?

PLease suggest a step by step guide, if u hav, for the concern, as i m new to linux and sendmail as well..

thanks
# 2  
Step by step instructions are provided in chapter 24 of the RHEL5 Deployment Guide
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