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On May 3, 1978, Gary Thuerk, a marketer for Digital Equipment Corporation, sent the first-ever unsolicited mass email via ARPANET – the predecessor to the internet. Targeting hundreds of users, his message advertised a product demo. Though it led to backlash, it also marked the beginning of email marketing – and what we now call spam. This small moment triggered a digital evolution (and irritation) that still shapes our inboxes today.