Option to not allow password change in webmail

In my company, I use an autologin for webmail but the "Password & Security" menu is visible there.
I don't want my employees to be able to change the password.
The WORST of all is that to change the password the system doesn't even ask what the current password is.

There is a way to disable "Password & Security" in the feature list and this should reflect in webmail as well. Or create an option for "Password & Security - webmail" there.