Today, unsolicited commercial E-mail is by far the most common complaint of those who tend to complain about such things. I often wonder why some people react so emotionally to unsolicited E-mail. Perhaps it is just the very real desire not to be bothered. I guess this question requires the attention of trained psychologists before it can be authoritatively answered. Over the years, the meaning of the term Spam has seemed to evolve.
Different people define the term differently.
Some people think that any unsolicited E-mail is Spam. Some think that Spam is only unsolicited commercial E-mail. Some would claim that not all unsolicited E-mail is Spam. Some even adopt such activity as an academic research pursuit. There is certainly no legal definition of Spam, and no total agreement in the Internet community as to what falls within the range of Spam.