Well - the script simply uses the php mailer - however if you do not have sendmail then you will have to reconstruct this line to include the smtpauth
if (mail($to, $subject, $msg, "From: $email\r\nReply-To: $email\r\nReturn-Path: $email\r\n"))
is going to become more like this
$smtp = Mail::factory('smtp',
array ('host' => $host,
'auth' => true,
'username' => $username,
'password' => $password));
$smtp->send($to, $headers, $body);See Here
The data is already at send.php - from there you can do with it what you choose.
Upload Limit: Well, it depends on your server if you are using a straight upload. If you use chunkupload it will allow you to upload huge files.
Are you on a windows server?
If you are using multipowupload you can set the allowed file types via the parameters. Check the docs here
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