Follow Ups with product attributes level

It would be very nice to be able to send out purchase emails based on product attributes.

We sell software for 1,2,3 years and we would like to send out expiry reminders. All software are variable product where an attribute is the number of years. Right now we only able to send out purchase emails if we configure several hundres of emails for each unique variation. The number of years is not handled at category level (we have categories like Windows or Android software).