title: Regarding Mailman gem in Rails Email inbound processing
body: <p>I need to work on Email receiving and inbound processing. 
  But I don't know how to run the Email server to receive mail.
  I'm searching for the way to find a solution for setting up email server to receive mail.</p>
  
  <p>Can Any one please suggest how to configure the working of Mailman gem for receiving emails and inbound processing.</p>