[FX.php List] Sending an automated email?

[List]

Hello

I'm am a rookie at this php and I am trying to send a confirmation  
email out.

I am running on OS X server 10.4.9 with FileMaker Server 8.

My question is how do I send out mail and more specifically how do I  
set the smtp.

I hope this is enough info, if not let me know what other info is  
needed.

Thanks

Mike