Looking for an email plugin to be developed

I’m looking for an email plugin to be developed to work with Wordpress and woo-commerce. It needs to be an email response that is custom to each product but I also want to be able to change the response so that eg the 25th customer of that product gets a response with a discount code, then the 50th gets a response with a different discount code etc

To that level of granularity will need to be custom built

If you have a sensible budget then you may be able to find someone on www.studio.envato.com

https://studio.envato.com/users/ki-themes