Discount coupons sent after few purchases

Hi.

Is it possible to setup a discount system as the example below?:

A customer buys a product once, he pays the regular price. After a few days a customer comes back and buys it again. It's his second buy. Now if he buyys a third time for the same regular price, the system will automatically send him a discount coupon code to use in the next order.

Is that possible to ahieve using default coupon module?

Zencart ver - 1.3.9h (newest), no additional mods.

Simple No.

There are modules available that would send out coupons based on customer behaviors. You should search for Autoresponders in the download section and read the documents on each modules. There are more than one modules out there.