For an Email integrated with Ensim you should leave the POP3 and SMTP services alone and install Mailenable or Mailmax on the server instead.Ensim has the details here:
ensim.com/products/webppliance/ndows/mail.html
Install Mailenable Standard (free) and then run the Integration Utility at
ensim.com/products/webppliance/ailenable3.html
Ensim now shows an extra item in the control panel for email.