How can we improve WHMCS?

Hi,
We are using the Email Marketer tool in order to send an offer to buy product 2 to a customer who bought product 1 by using the Number of Days after order date.

The problem is that if the customer ordered several copies / units of the same product via this order - he will get the email over and over again - one email per product he ordered - even if all the products where ordered together on the same order.

So if the client order 12 units of product 1 in order number 123 - he will get 12 emails when we use the Email Marketer tool to tell him about product 2...

Please make sure that when using the Email Marketer tool - only one email is sent per product per order - and not per product only.

Thanks!
Ram