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S Balaji 8S Balaji 8 

I want to throw an error message after clicking Send List email by checking any field at the backend , if the field is populated then allow the user to send email otherwise thrown an error.

Can anyone help me how we can achieve this please?
Syed Insha Jawaid 2Syed Insha Jawaid 2
Hi Balaji

In case user tried to Send bulk email using that button then what should happen?