When you see or write the sentence alike following,
"You may terminate this XXXX with 30 days prior notice."
You interpret this "notice" includes e-mail ?
And if it writes,
"You may terminate this XXXX with 30 days prior written notice."
This "written notice" includes e-mail ?
I know it should be determined by legal contexts, but I would like to know how people/consumer generally think to see such "notice"/"written notice".