The New York Times recently reads:
"Signs you’re an old fogey: You still watch movies on a VCR, listen to vinyl records and shoot photos on film. And you enjoy using e-mail." 
You need to reach your customers where they live, and it isn't through e-mail anymore.  People are living through social media (e.g., Facebook).  
What is your business doing to meet them there? 
See:
http://www.nytimes.com/2010/12/21/technology/21email.html?_r=2