I thought that was the point of cronless postie???
Do you mean to tell me there has been no push technology invented that will execute a script on a server without human intervention besides cron? I realize you need a browser to make a request to the server in order to serve a page, but surely someone has figured out by now how to make a web server self-request, no?
Still, my understanding was that cronless postie would check Postie like it was an RSS feed. With the whopping 2 lines of documentation it is difficult to tell what the developer had in mind. (not that it is really documentation – it is actualy 2 lines of comments in cronless_postie.php)