We have added this library to all our servers, so now you can use it without having to upload it to the server. Here are the steps to use it:
The library is located in /usr/local/php/Swift and it will kept up to date with new releases.
$swift = new Swift(new Swift_Connection_NativeMail("-firstname.lastname@example.org"));
$message = new Swift_Message("My subject", "My body");
if ($swift->send($message, "email@example.com", "firstname.lastname@example.org"))
echo "Message sent";
echo "Message failed to send";
For more information check out the Swift documentation which is pretty good.