I'm using two domain names for one website on multisite. Both url's should go to the same website but Google shouldn't penalize them for duplicate content.
The plugin can set a primary domain so the namecard domainname gets kind of redirected. But what will Google see? Is it a 301 redirect link? Otherwise I shouln't use the plugin, but redirect it at the htaccess file.
A little more explanation why I use this construction. One name is used at my namecard and the other one has a more 'SEO keyword name'.
My namecard website name: Adrian.com
My SEO keyword name website name that I use as the primary domain: http://www.coolwebsitedesigner.com
Both url's should go to http://www.coolwebsitedesigner.com but Google shouldn't penalize them for duplicate content.