これで試してください
<?php
/* Setup your Subject and Message Body */
$subject='Testing php Email';
$body=' Put Your Text Message Here.';
/* Specify your SMTP Server, Port and Valid From Address */
ini_set("SMTP","mail.yourdomain.com");
ini_set("smtp_port","25");
ini_set("sendmail_from","fromYou@yourdomain.com");
/* Additional Headers */
$headers = "Cc:Real CC Name <ccUser@theirdomain.com>\r\n";
$headers .= "Bcc:Real BCC Name <bccUser@theirdomain.com>\r\n";
/* Try to send message and respond if it sends or fails. */
if(mail ('ToPersonsName <toPerson@theirdomain.com>', $subject, $body, $headers )){
echo "<h2>Your Message was sent!</h2>";
}
else{
echo "<font color='red'><h2>Your Message Was Not Sent!</h2></font>";
}
exit;
?>