Is there a native function or plugin to allow admins to email all users? I want to be able to provide the admin with a function so that they can email all registered users of the site.

Is there a native function or plugin that would make this possible?
Currently there isn't a native function to do this.

The only plugin that I know of that can do this, is Sprout Email from Barrel Strength Design.



EDIT:

I just released a plugin called Craft-Mailer which does what you are looking for.