I learned for myself how to factory-reset the sender reputation of my domain– tangochilesauce.com, whose DNS had accumulated years of poisoned Klaviyo and SendGrid records. This tanked our deliverability and caused Tango emails to land in people's spam folders, which Klaviyo or Mailchimp will never show you. This deep clean fixed the issue, and our very next email saw a revenue increase of 1800%. I then designed and built a full customer-lifecycle set of Tango Emails — 34 emails across 14 automated flows, end to end. Welcome, abandoned cart, checkout, browse, post-purchase, review, cross-sell, replenishment, win-back, sunset, birthday, VIP — every stage of the customer journey, each with its own emotional tone inside one brand system. I wrote the voice (every email should sound like a friend at the cookout), designed the system, and engineered the production pipeline: a Next.js design source, output as bulletproof table-based HTML that lands under Gmail's 102KB clip limit and renders identically across Gmail, iOS Mail, Outlook and Yahoo.