I have this working under 7.10. But I did it long time ago, so cannot help much out of my memory. If you try with more specific questions, I can check my setup. I remember doing something with the help of general Asterisk docs and setting up mail local SMTP to send mails (I think I did by relaying to my ISP SMTP server)..
Will be happy to check my setup if you come up with more specific questions...