Notification emails going out but Subscription emails are not

I believe that I have set up the email parts correctly, as I can post a message via email, and I receive the admin email notifications telling me when an item is posted. However, even though I have subscribed to the site for instant delivery I receive no subscription emails from the site. I can't figure out why this is, so I'm writing for help!

I'm also concerned with understanding the process of how to set the site up so that folks who submit posts via email can receive replies from EasyDiscuss, and reply to those to carry on a conversation. This is a key reason we wanted EasyDiscuss - I'm just not understanding how to set it up for this using the documentation at hand.

thanks,
Charlie