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ShannuShannu 

I have a requirement to build flow on Email Message object : When an emailmessage ‘first opened’ field is updated email the sending user an email

SubratSubrat (Salesforce Developers) 
Hello Sai ,

I cam across a Blog discussion that would help you with your requirement -> https://jenwlee.com/2016/07/05/standard-email-message-object-process-builderflow-use-case-create-task-when-follow-up-email-sent/

Hope this helps !
Thank you.