I haven't conducted any testing, but I've read several articles which said not to use noreply. In addition, as a customer, when I receive an email from a 'non noreply', I feel better and I feel that they're there to help. Look at:

- http://customer.io/blog/dont-use-noreply-on-emails.html

- http://blog.cakemail.com/why-you-should-never-use-a-noreply/

I think this is the link ljf was looking for:

http://news.ycombinator.com/item?id=4558433