title: How to disable sending double emails to customer aftre registration in magento?
body: <p>After registration customer recieve email imforming about 10% off. It works fine but that email is dubled. The same email is sending twice times. 
  Swiching off Mailchimp doesn't resolve that problem so probably it is not in configuration.
  Probably two emails modules capture event but I have no idea how to fix it.</p>