[PHP-WINDOWS] PHP 4.2.3 and Apache 2.0.36

Hello;

I have PHP 4.2.3 on Windows 2000 advanced, and when
I try to use the mail funtion, the server returns an error.

<?
mail("m@mrpg.dhs.org","Formulario","cuerpo");
?>

The page sais: Warning: Server error in c:\url\file.php on line 2.

I have Imail as Mail Server. Do you know why this happen?

Thank you.

Francisco Murillo