Redirecting Domain Names
If you have to change your domain name and you want to point more than one domain to one specific domain then the best thing to do is redirect them via a 301 redirect to one of the domains.
RewriteEngine on
RewriteCond %{HTTP_HOST} ^olddomain\.com [OR]
RewriteCond %{HTTP_HOST} ^www\.olddomain\.com
RewriteRule ^(.*)$ http://www.newdomain.com/$1 [R=301,L]
So now the olddomain versions will be redirected to the newdomain url.
