Hi @Karnik, Madhura ,
You could use Insights to track email and document open rates. Insights can tell you how many people have opened your email and the average time they spent reading that email. Insights also tells you how many email recipients opened a document that you shared in the email as a link or as an attachment (this insight works for documents that are stored in SharePoint or in OneDrive for Business).
For Reference: Tracking email and document open rates with Insights
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