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Email Tab is missing Under Activity in salesforce lighting

Email Tab under Activity is Missing in Sandbox, its available in Production.
I tried in add in Edit Lighting Record pages, But i can't .
This issue appears recently....
Any one idea how to fix this ?

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Best Answer chosen by VRK
VinayVinay (Salesforce Developers) 
Check if email deliverability is set to 'All email' in your sandbox.

Check below references:

Hope above information was helpful.

Please mark as Best Answer so that it can help others in the future.