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Join the discord: https://discord.gg/asfXzBUhZr","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"BillionMail\" from https://github.com/Billionmail/BillionMail into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/Billionmail/BillionMail","github_repo":"Billionmail/BillionMail","version":"1.0.0","license":"AGPL-3.0","updated_at":"2026-06-16T10:06:56.046809+00:00","canonical_key":"billionmail/billionmail","recommendation_reasons":["Matches task terms: email","Strong GitHub adoption: 15,138 stars","Quality score 72/100","Install handoff is available","Repository freshness signal is available"],"urls":{"web":"https://www.openagentskill.com/skills/billionmail-billionmail","api":"https://www.openagentskill.com/api/agent/skills/billionmail-billionmail","install_api":"https://www.openagentskill.com/api/skills/billionmail-billionmail/install","audit":"https://www.openagentskill.com/skills/billionmail-billionmail/audit","repository":"https://github.com/Billionmail/BillionMail"}},{"rank":9,"match_score":276.7,"slug":"thunderbird-thunderbird-android","name":"Thunderbird Android","description":"Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)","tagline":"Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)","category":"productivity-automation","tags":["email","automation","productivity","android","communication","mozilla","kotlin","github"],"author":{"name":"thunderbird","verified":true,"url":"https://github.com/thunderbird"},"attribution":{"status":"community_indexed","statusLabel":"Community indexed","shortLabel":"COMMUNITY INDEXED","sourceLabel":"GitHub star discovery","sourceDetail":"thunderbird/thunderbird-android","creatorName":"thunderbird","creatorUrl":"https://github.com/thunderbird","sourceUrl":"https://github.com/thunderbird/thunderbird-android","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/thunderbird-thunderbird-android#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals."},"stats":{"stars":13611,"forks":2750,"downloads":0,"rating":0,"review_count":0,"quality_score":72.14},"quality":{"score":100,"tier":"excellent","label":"Excellent","summary":"High-confidence pick with strong adoption and healthy maintenance signals.","signals":[{"label":"GitHub stars","value":"14K","tone":"positive"},{"label":"Freshness","value":"1d ago","tone":"positive"},{"label":"Install ready","value":"Yes","tone":"positive"},{"label":"License","value":"Apache-2.0","tone":"neutral"}],"warnings":[]},"trust":{"version":"trust-score-v3","score":95,"tier":"production","label":"Production candidate","summary":"Strong OpenAgentSkill Trust Score across adoption, recent maintenance, license clarity, documentation, dependency/runtime risk, install safety, permission surface, and install availability.","recommendedAction":"Shortlist for production use, then run a normal repository and dependency review.","dimensions":[{"id":"github_adoption","label":"GitHub adoption","score":100,"weight":0.13,"status":"pass","detail":"14K GitHub stars"},{"id":"repo_activity","label":"Stars/forks activity","score":97,"weight":0.08,"status":"pass","detail":"14K stars, 2.8K forks; 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