g1smd - 9:03 am on Jan 11, 2013 (gmt 0)
The main issue is whether they are using example.com or www.example.com although you could just force www. on all users. They need to be asked, or at least confirm, before installing.
I don't know why I put rules 32a and 35a in there. I would delete them and uncomment rules 32b and 35b.