RewriteEngine On
RewriteCond %{HTTP_HOST} ^bli.bla\.com$ [NC]
RewriteRule ^(.*)$ http://bla.bli.com/$1 [R=301,L]
or
RewriteCond %{HTTP_HOST} ^www1.bla.com$
RewriteRule (.*)$ http://www5.bla.com/$1 [R=301,L]
This example works 100% if implementet right. (TYPO3 .htaccess: "# Add your own rules here.") Maybe you should delete Cooluri or Realurl Cached links.