RewriteEngine On
RewriteCond %{HTTP_HOST} ^siteadresi.com [NC]
RewriteRule ^(.*)$ http://www.yenisite.com/kategori [L,R=301]

RewriteCond %{HTTP_HOST} ^www.siteadresi.com [NC]
RewriteRule ^(.*)$ http://www.yenisite.com/kategori [L,R=301]