Send email if commenter is a guest?

[Gipa]

Hi

I have both guests and registered users commenting on my site.
When guests comment, I would like to send them an email suggesting that they register.

How can I do this...?

Maybe you can help me find the "send email" code? I tried to find it but without any luck...

I figure that if I find it, I can copy the current code and edit the copy, adding some code for "if not logged in, then send" and the filename for the new email...?

I really hope you can help me.     


      Rie