title: Spring boot - How to create a CSV file and send as attachment at runtime
body: <p>Im trying to create a CSV file to send as attachment in mail.
  <strong>I need to create the CSV file at runtime without storing in disc</strong>.
  <em>I read that we cannot send as attachment without storing in any physical location.</em> Is it so!
  I'm new to this, if anybody could provide some inputs to get started with this.</p>