For Each: Unable to cast object of type “System. Char” to type “System.Net.Mail.MailMessage”

@Yoichi @vishal.kp @Karthik_Reddy_A Thank you all for your advice. I took your advice, and it works!!!

Another error after Debugging,

I am working in non-tech related background, and I am new to UiPath. I do appreciate all your help and time.