After the line that reads ‘RewriteEngine on’ in the .htaccess file which is in the Magento root directory add these 2 lines.
RewriteCond %{HTTP_HOST} ^www.yourdomain\.com$ [NC]
RewriteRule ^(.*)$ http://yourdomain.com/$1 [R=301,L]
November 21, 2009
Magento – Force use of non-www domain
