Sending a notification email to a list of users

Hi fellow bubblers,

I need help with an automatic email notification system I want to implement:

A USER clicks to like a category TAG that is attached to a list of PRODUCTS and when another USER posts a PRODUCT with that particular category TAG, a notification email should be sent to that first USER, reporting that someone posted a PRODUCT with a TAG that he/she liked.

Any suggestions on how to implement this?

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