.htaccess: грамотный 301 редирект на главное зеркало

<IfModule mod_rewrite.c>
  RewriteEngine on   
  RewriteBase /
 
    # 301 redirects from all to www
  RewriteCond %{HTTP_HOST} !www.zencoder.pro
  RewriteRule (.*) http://www.zencoder.pro/$1 [R=301,L]
 
    # 301 redirects from all to domain
  RewriteCond %{HTTP_HOST} !zencoder.pro
  RewriteRule (.*) http://zencoder.pro/$1 [R=301,L]
</IfModule>