[PHP] mail() function

[Phil Schwarzmann]

I want to write a simple script that sends an e-mail message using PHP.
 
I'm assuming that my web-host has the mail function hooked up to the
e-mail server (should I be assuming this or should I assume that it's
NOT hooked up?).
 
What is the syntax  for this command?
 
something like this... ? (assuming that the variables contain the
proper data)
 
mail($contactemail, $subject, $message, $headers);
 
THANKS!!