Hi,
I am actually also having a similar problems as i’m trying to redirect as site from .com.au to .com and the WordPress site appears to be ignoring both “Redirect” and “Rewrite”
I would also like to know how to force the server to do a redirect via rewrite.
RewriteCond %(HTTP_HOST) ^mydomain\.com\.au [NC]
RewriteRule (.*) http://www.mydomain.com/$1 [R=301]