Email Soft Copy Purchased In Orders Automatically?

Is there a setting that can automatically email purchased soft copy to clients once payment has been made. Most parents in my school orders download themselves, however a fair percentage (maybe 5-10%) do not realise they are supposed to download them manually once purchased. Sometimes they do not get back to me for months, or years, when they realise they have not "received" the jpegs they were supposed to download when they purchased.

I rarely keep albums up more than 1 year as my server hosting runs out of space so it can become a hunt for me to find the offline photos so I can manually email them.

Much thanks

There is not an option to send them the photo files in the order email.