ABSTRACT
E-mail is probably the most attractive topic for users. Almost every user on the network uses electronic mail (known by its acronym e-mail). Users do not know very much about UNIX, but they like to use, and they benefit from using, e-mail. Usually this is a love-hate relationship between users and e-mail; users love having an e-mail system, but they hate it when it does not work. This relationship is exacerbated by the fact that only a few of them have any idea how e-mail actually works and really understand e-mail processes. The most common misunderstanding is to confuse e-mail with other popular network applications, like telnet or ftp. And when the DNS issue arises during a discussion of e-mail, the confusion is complete.
