How to Build an AI Cold Email Workflow with Smartlead and GPT-5.5 Build a cold email workflow that pairs Smartlead deliverability with GPT-5.5 personalization. Architecture, prompt, orchestration script, and metrics to track included. May 26, 2026 • Luka Mrkić GPT-5.5 OpenAI cold email AI outreach B2B sales sales automation lead generation