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Reviewing through your inquiry I think you will find the Core Help - Using Impact Metrics and Using the Detailed View sections of the documentation helpful. Specifically, the email section tracks the following:
Counts how many email notifications occur when one of the following events happen:
- Use @mention in content, comments, or replies.
- Share content.
- Add collaborator to content.
- Reply to discussions, or comment on blog posts, videos, or documents.
- Create content when someone who follows you has email notifications enabled.