Create a .htaccess file with the below code, it will ensure that all requests coming in to domain.com will get redirected to
www.domain.com 
The .htaccess file needs to be placed in the root directory of your old website (i.e the same directory where your index file is placed)
Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^domain.com [nc]
rewriterule ^(.*)$ http://www.domain.com/$1 [r=301,nc]
Please REPLACE domain.com and
www.newdomain.com with your actual domain name.
Note* This .htaccess method of redirection works ONLY on Linux servers having the Apache Mod-Rewrite moduled enabled.
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