I’ve tried the redirect under Manage Domains > Edit > Redirect but, after the redirect, www.website.com/file.html doesn’t work anymore.
You’d have to create an index.html file so when people go your site without specifying which file, it will issue a META Refresh to your Flickr account.
you can do this with .htaccess mod_rewrite, something like this (untested):
RewriteRule !^/file.html$ http://www.flickr.com/etc
that should redirect anything that’s not for /file.html to http://www.flickr.com/etc.
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