BVDW's email marketing guide tackles AI agents and a 376-billion daily inbox: Germany's digital economy association BVDW published a 24-page email marketing guide on March 18, 2026, covering AI agents, KPIs, accessibility, and GDPR compliance. https://ppc.land/bvdws-email-marketing-guide-tackles-ai-agents-and-a-376-billion-daily-inbox/ #EmailMarketing #AIAgents #DigitalEconomy #GDPRCompliance #KPI