Only way I know of is with a script that runs after the policy which uses the mail command in Unix. Though there are some other more advanced ways of sending mail from the command line, but I think most others would need some kind of smtp information.
Of course, since policies right now can't really send back an exit code to a script, you would need to craft your script in a way that would check the success or failure status of the policy in question. Meaning, you need to know how to determine if the policy actually worked or not, because I assume the purpose of this is to send an email either on failures, or just an email that would tell you (or the recipient) whether the policy ran successfully or not, correct?
