title: How can I send regularly scheduled emails without setting up a cron job?
body: <p>I'm setting up a subscription site using PHP that will allow admins to set up schedules (monthly, weekly, daily, all down to the minute) for when emails will be sent out to subscribers. Is there a plugin, extension, or even a library, that allows me to send these emails based on a predetermined schedule?</p>
  
  <p>I thought of setting a cron script to check every minute for pending emails, but with amount of traffic I'm estimating for my site I'm worried that it would put too much of a strain on my servers. </p>
  
  <p>It would also be nice if this plugin, extension, etc, could provide analytic data in return. But that's definitely not vital.</p>