stevember, on 01 February 2013 - 13:09, said:
Multiple domains redirect to one is fine.
Multiple domains with same content is very bad.
That basically sums it up, you should also either have your site on www.mysite.com or http://mysite.com
and make the one you don't wish to use redirect to the other. Don't have your site directly accessible on both.
I prefer http://mysite.com
personally and always make the www redirect to that.