This is an email from the F.B.I i NEED TO KNOW if its real it seems very serious thank you?

Hey John do not panic , such kind of E-mails are sent to many online users in bulk everyday. people try to make money out of these mails , which are just useless.its very simple figure out the sender , click on the sender's mail and receipients mail too. very simple , these are just junk ! you can block the sender. dont worry