E-mail alert don't work!

[p.schweingruber]

Hi guys
I have a big problem. I had to config cacti to alert me (e-mail) when a Problem appears.
Now I have config complet install cacti (Version 0.8.7b) under windows server 2003 and all works excepting the alert per mail.

I have tried with SNMP and the PHP Mail() Function. I make this settings under the <setting> tab under Mail /DNS. But both function:
SNMP and PHP Mail not work.
can somone help me to configure the e-mail alert option?

Sorry for my bad english and thanks for any help