Identify and suppress ghost contacts who received marketing emails but never opened any. These contacts destroy sender reputation and deliverability. Hybrid approach: API for discovery, manual UI for suppression.
Install
npx skills add TomGranot/hubspot-admin-skills --skill suppress-ghost-contactsnpx skills add TomGranot/hubspot-admin-skills --skill suppress-ghost-contacts -a claude-code -gnpx skills add TomGranot/hubspot-admin-skills --skill suppress-ghost-contacts -a codex -ggemini skills install https://github.com/TomGranot/hubspot-admin-skills.git --path skills/suppress-ghost-contactsgh skill install TomGranot/hubspot-admin-skills suppress-ghost-contactsgit clone --depth 1 https://github.com/TomGranot/hubspot-admin-skills /tmp/TomGranot__hubspot-admin-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/TomGranot__hubspot-admin-skills/skills/suppress-ghost-contacts ~/.claude/skills/suppress-ghost-contacts # Claude Code
cp -R /tmp/TomGranot__hubspot-admin-skills/skills/suppress-ghost-contacts ~/.agents/skills/suppress-ghost-contacts # Codex, Cursor, Gemini CLI, Copilot, OpenCode