Specific mail notification [closed]

There is a plugin that (in my opinion) will do just the job for you.

It is the “Peter’s Collaboration E-mails”. You can find it in the WordPress plugins repository.

From the plugin’s description:

“You can create groups of Contributor users and assign different moderators for each group. In other words, different users can be notified based on who wrote a post. You can also assign moderators based on various taxonomies (such as tags, categories, and more) on post, pages, and custom post types. If a Contributor user belongs to multiple groups and/or a post has multiple taxonomy values, all moderators who have been assigned to the relevant groups or who match the post type rules are e-mailed.”

I hope that helps.