I have built a email / newsletter application that allows my client to manage campaigns and their lists.  When they do a send I have the system setup to queue these emails to a database.  Then as script picks up a few emails each minute passes them on to smartermail, which then sends them out. This helps to avoid any delivery spikes which many of the major ESPs (yahoo, gmail, ext ) would consider spam.  The problem we are running into is accurate tracking of the bots.  We need to be able to track when an open or link click is a real person rather than a bot.  

For what I have read the most accurate way is to track when the email was sent / delivered, and compare that to the open / click datetime.   If the open / click happens within a few seconds of delivery that is often a bot or filter scanning the message.  Everything else could safely be considered organic.  I can track the datetime I pass the email from my quote to smartermail for delivery. But sometimes that email might sit in the spool for a a while.  

What I need is a way for smartermail to give me a callback to my server, that they have successfully delivered the message.  Is there anyway to do this?