Dan Shipper, the CEO of media and AI software company Every, told Business Insider that he thinks people are underestimating Codex. Alex Broadway/Sportsfile for Web Summit via Getty Images Dan Shipper says he doesn't write many of his routine emails. Instead, the CEO of Every — an AI-focused media, software, and consulting company — said he uses OpenAI's Codex to read his inbox, check his calendar, propose meeting times, and draft responses. The tool is not allowed to send emails without his approval, but Shipper said much of the scheduling correspondence around his Business Insider interview was generated by AI. "All the words are pretty much Codex," Shipper said. He's considering changing the "From:" field in his email to indicate when messages are drafted with his AI agent's help. His New York City-based business is built around AI. Shipper cofounded the company in 2020 with backing from Starting Line and Reid Hoffman.…