Virtuemart product availability reminder option to customer

[Agalya]

Hi,

Can you please help me, how to add Virtuemart product available reminder option based on size of the product to customers. So that when customers opens and see the availability of product in particular size and if the product is not available on the size the customer can click on the reminder option with submitting there email. If the stock available, a mail should go to user with the information of the product available now.

Looking forward for reply

Regards,
Agalya