A spam spider is a email spider that collects as many email addresses as possible. The purpose of course is to spam you with email later.
In the same way, a ” spambot is a program designed to collect, or harvest, e-mail addresses from the Internet in order to build mailing lists for sending unsolicited e-mail, also known as spam“.This is how searchexchange.techtarget.com defines a spambot.
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