C# Code: MailMessage Msg = new MailMessage (); // Sender e-mail address. string FromMail = "noreplysofttechsolving@gmail.com" ; string Password = "xxxxxx" ; //sender email password Msg.From = new MailAddress (FromMail); // Recipient e-mail address.. string ToMail = txtEmail.Text; Msg.To.Add(ToMail); string MsgBody = "Thank you!!!!" ; AlternateView htmlMsgView = AlternateView .Create...