define batch size, batch period, throttle in swiftmailer

Question

What are the plugins available for the following php parameters in Swiftmailer

define("MAILQUEUE_BATCH_SIZE",480);

define the length of one batch processing period, in seconds (3600 is an hour)

define("MAILQUEUE_BATCH_PERIOD",3600);

to avoid overloading the server that sends your email, you can add a little delay

between messages that will spread the load of sending

you will need to find a good value for your own server

value is in seconds (or you can play with the autothrottle below)

define('MAILQUEUE_THROTTLE',7);

Thanks