Running regularly

If it turns out that it was just the process that was automatically killed on a time interval, then you could easily write a script that would spawn a new process and then kill the parent.

To continue the explanation, no single process would ever execute for a long time, since it would, phoenix-like, periodically die and be reborn. A clever mail filter hack could also check to see if it was still alive (say, with a socket) and then start it running again if it had stopped. Eric