well, just tread this in Wikipedia: the electronic spam name is due to this SPAM
"By the 1990s, Spam's perceived ubiquity led to its name being adopted for unsolicited electronic messages, especially spam email. "
"By the 1990s, Spam's perceived ubiquity led to its name being adopted for unsolicited electronic messages, especially spam email. "
Spam (food) - Wikipedia
en.wikipedia.org