How send e mails?

Some may seem fairly harmless, for example, a grammar school student wishing to see how many people can receive his e-mail for a science project, but can grow exponentially and be hard to stop. They may contain false information, such as the famous "Forward this to everyone you know and if it reaches 1000 people everyone on the list will receive $1000" type e-mails. They may also be politically motivated, such as "save the scouts, forward this to as many friends as possible". Some recent chain e-mails say that a company "will stop its free email service if you don't send this message to X people". Some threaten users with bad luck if not forwarded.