Topic: Removing From Field

[Mike]

Hi Guys,
   I'm using SME Server V5.1.2 with IMP Version 2.2.7. My problem is how do I remove or hide the from field when composing a new mail, the users can modify it and change to whatever address they want. How can I upgrade my Horde IMP? What possible cause when I do that?
   Any suggestion is much appreciated.

Thanks

Mike