Allow per-Space admnistrator From address for email

I'd like to configure a notification email From address per Space. I'd like to create wikis for different projects, have those project wikis in separate spaces, have a primary contact be the owner of the space, and have page change messages come from their email address. In this way, bounces and reply messages will go to the administrator of the space, not to the administrator of the entire installation.

Thanks,
==Leonard