Generally, I'd think each user should be able to specify whether or not they want to automatically respond to those. Perhaps, once a "buddy-list" is supported, you'll have an option something like:
Send Message Read notifications: Yes | No | Only for users in my buddy list
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com
Send Message Read notifications: Yes | No | Only for users in my buddy list
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com