This cannot normally be achieved. You can probably create an ActiveX control
and insert it on the first slide in PowerPoint. Have the ActiveX control
send email when it is instantiated. But this method won't work if the
presentation is opened through PowerPoint Viewer since it does not support
ActiveX controls.

- Chirag

 PowerShow - View multiple PowerPoint slide shows simultaneously
 http://officeone.mvps.org/powershow/powershow.html

As Chirag mentioned it can't be done "automatically", but can easily be done
via a VBA macro assigned to an object click.  I use this method in my
computer based training (CBT) presentations using PowerPoint.  I have a
sample CBT file you can check out at:

http://www.pttinc.com/cbt_development.html

Unfortunately, the code is quite specific depending on the type of e-mail
client you use so I have not put one of these up on web site.  Depending on
whether you use Outlook or Lotus Notes, I could send you a sample file.

One of the modules I use in my CBT package is one that sends an e-mail upon
completion of the CBT, or one that automatically updates an Access database
with scores, etc.  I tent to push the Access version more because with
problems associated with access e-mail clients using Outlook (and recent
service pack changes), the e-mail version is more obtrusive because the user
sees this happening.  However, the Access database method is transparent to
them.

If you want more info, feel free to holler back.