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Set up additional domains as "parked" domains.  Then,  open the .htaccess file for the primary domain and add these lines immediately after the   RewriteEngine On  line.

RewriteCond %{HTTP_HOST} ^(www.)?BADDOMAIN.com [NC]
RewriteRule ^(.*)$ http://GOODDOMAIN.com/$1 [R=301,L]

Change the BADDOMAIN AND GOODDOMAIN as appropriate.