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I have been asked to designed a website for a local charity that will take donations online (via PayPal) but they have a prize on offer donated by a local travel agent of a weekend away in Rome for two.

The idea is that people will log onto the site, donate an amount (anywhere from £5 to £50 I suppose) and once the entry date is finished a person will be selected from random and that person will win the holiday.

I have set-up the PayPal payment and if a person makes a donation online then the Charity obviously get an e-mail receipt of payment.

Is there any software that can randomly select an e-mail message from a folder of these PayPal receipts or do you think there's a better way of selecting a person at random?

The Charity also will probably do the draw at a Charity dinner as well so the system will need shown in public.

Any ideas or advice would be helpful!