You could always use the task facility in your email program and set the reminder to play your own (loud) wav file, preferably something you don't like
Use the scheduled task program built into windows. It'll start whatever you what whenever you want it. I use that when I'm around the computer and my phone otherwise.
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Also known as an alarm clock.
It is free and kicks ass. I have not found anything better. I have been using Citrus for over a year... highly recommended.
cheers