Why can’t we trace the sender of an email ?

Each email has an invisible header containing information like time stamps and routing information. It does not contain personal details like the sender’s street name or phone number. However, the header does contain the orginating ip address. That can narrow the origin down to a city or district, but seldom anything more specific and certainly not to an individual.

Online webmail services like Gmail are even more                                                                               anonymous. A Gmail message, for instance, can                                                                             only be traced back to a Google ip address.