Most startups blast emails and wonder why they land in spam. This skill treats deliverability as infrastructure, covering SPF/DKIM/DMARC setup, transactional queues with retry logic, and the IP warm-up schedules that prevent blacklisting. It pushes hard on the fundamentals: multipart messages with plain text fallbacks, proper bounce handling, and the DNS records that actually get you into inboxes. The anti-patterns are specific (HTML soup that breaks in Outlook, image-only emails that trigger spam filters). Use this when you need email to work at scale, not just technically send.
npx skills add https://github.com/davila7/claude-code-templates --skill email-systems