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Hi pooja,AND(ISCHANGED(Email), NOT(ISNEW())) is working for me.Actually you dont have to check the NOT(REGEX( Email ,'([a-zA-Z0-9_\\-\\.]+)@((\\[a-z]{1,3}\\.[a-z]{1,3}\\.[a-z]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})')) because email field throws that error if email is not in proper syntax. Standard validation is performed on it. Its working perfectly for me. If any problem, you can ask me. If working, please mark this as best answer