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130 Chapter 3 • E-Mail: The Weapon of Mass Delivery
Summary
Unsolicited bulk e-mail (UBE), better known as spam, is a form of exploitation
used by phishers today.The actual process of creating and sending e-mail involves
two types of systems: the mail client and the mail server. Every e-mail contains
header information that contains collective server and client information neces-
sary for the routing and delivery of e-mail from source to destination. A typical
e-mail can pass through at least four different servers before it reaches its final
intended destination address.
In a typical e-mail setup, two communication ports are usually used ...