Oftentimes, the message contains helpful information, and I'm happy to get it:
- My package is en route, and here's the tracking number,
- Here's a discount code for our website,
- We got your message and are working on it, expect a response in 'x' amount of time.
If you want to provide better customer service, and care enough to setup a messaging system to keep your customers informed, setup the reply address to go wherever you'd like within your company. Don't make it harder for me to communicate with you than anyone else I do business or correspond with.