Your mileage may vary, since this code frag is from a Linux/Sendmail box, but since the php.ini file lists the command for mail, and that is already working for you, perhaps this will work for you too...
$result = mail ($emailaddress, $subject , $emailtext,
"From: Automated Support <support@$SERVER_NAME>\n" .
"Reply-To: support@$SERVER_NAME\n" .
"X-Mailer: PHP/" . phpversion() . "\n" .
"bcc:$emailcopy1\n".
"bcc:$emailcopy2\n");