Unsubscribe, Click-Through and Open Rates

Hello.  Would greatly appreciate learning about how you BBNC email users are gathering and reporting on email analytics.  If you are, how are you able to determine which email a recipient opted out of or unsubscribed from?  If you are, how are you determining demographic info about who is opening your email messages and in reverse, who is not opening your email messages?  Our Foundation/Alumni Association is very dependent on email but we are challenged by determining if these efforts are successful or which efforts are more successful than others.  From the Net Community tab in RE, we can see who clicked a link on a certain message but not which link.  In BBNC, we can see who clicked the email preferences link but that doesn't always directly tie to an actual action to unsubscribe or opt out.  I am hoping there is a smarter person than I out here who can offer guidance and advice!  Thank you!