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Ketan MahetKetan Mahet 

Predefined Field Value for Send Email

Hi,
  For Case screen we have two related list ("Emails", "Activity History") from where we can send email. I want to auto populate Case Subject line as email subject. How to achieve this? Even I tried "Predefined Field Value for Send Email" but it is also not auto populating the value.

 
ShashankShashank (Salesforce Developers) 
You can probably try adding the case subject as a merge field in the template that you use for the email.