I read the disclaimer on an email that was sent to me and and it states: "If you are not an intended recipient of this e-mail, please notify the sender, delete it and do not read...".  How does the sender expect me to comply with this disclaimer if I have to read the email in order to know there is a disclaimer? 

When you are on an airplane why do they force you to fasten your seatbelt prior to take-off, but they don't show you how to fasten your seat belt until you are supposed to have it fastened?