Cold email reply rate only resolves at ~1500–2000 sends per variant; subject-line opens at 100–500 per variant; delivery and text sanity-check at 50–100. If your list does 300 sends a month, the offer question is unanswerable — so test what your volume can actually settle: delivery, domain health, spam placement, and which subject gets opened. Below the threshold, "winning" and "lucky" are the same number on the dashboard, and you scale the noise instead of the signal. Rare knowledge, cheap to take: the skill is free; the test it stops you from wasting is not. npx skills add axelfreeman/marketing-mindset — https://axelfreeman.github.io/marketing-mindset/ If your last "winner" was decided on 60 sends, what do you actually know?
What kind of domain health metrics do you recommend tracking for these smaller lists, and how do you prioritize them?