Email turns 55 this year, and the industry is marking the milestone with a notable strategic shift. A Practical Ecommerce report framed by the Mean CEO Blog positioned email as a durable business asset, while MediaPost's Email Insider Summit coverage showed major brands pushing harder into behavior-based messaging, segmentation, and AI-assisted workflows.
The timing is significant. The first email was sent in 1971 by Ray Tomlinson, a computer engineer. Email marketing as a commercial discipline was effectively invented by Gary Thuerk in 1978, when he sent the first mass marketing email to 400 recipients via ARPANET. The results of that first email blast were impressive even by today's standards, yielding $13 million in sales. Fifty-five years later, the channel is still generating returns that most paid channels cannot match.
From the Inbox to Intent: What the Email Insider Summit Revealed
MediaPost's Email Insider Summit Spring 2026 took place April 12 to 15 at the Ocean Reef Club in Key Largo, Florida, bringing together senior marketing and CRM leaders from major consumer brands. MediaPost reported from the event that brands such as PepsiCo, Etsy, Hilton, TurboTax, and Hibbett are leaning into personalization, AI support, and behavior-led outreach.
The central theme was a clear departure from scheduled, calendar-driven sends. Real segmentation, as discussed at the summit, groups people by intent, stage, use case, pain, purchase pattern, or behavior sequence. TurboTax's example showed how tighter qualification of experts improved segmentation quality. The most grounded AI use case came from Hibbett, where AI helped automate segmentation and gave the team more time for higher-value retention work.
This shift is data-backed. According to InboxAlly, marketers using advanced segmentation see a 760% increase in revenue, and behavior-based emails generate roughly 3x higher engagement than scheduled campaigns, because they are triggered by specific user actions.
