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コールドメール検証・推測スキル

ユーザーがコールドメールを検証したい、リードリストを充実させたい、またはCSVからメールアドレスを自律的に推測したい場合に使用します。ValidEmail.coまたはオープンソースのReacherエンジンを利用します。

コールドメール検証・推測スキル とは?

このスキルは、名、姓、会社名を含むリードのCSVを自律的に処理し、企業ドメインを特定し、一般的なメール形式の組み合わせを生成し、厳密に到達可能性を検証することで、連絡先情報が不足している問題を解決します。主な機能は、Clearbit APIを使用したドメイン発見、3種類のメール形式([email protected], [email protected], [email protected])の自動生成、そしてValidEmail.co、セルフホスト型Reacher、またはローカルReacher CLIの3つの方法での検証です。ValidEmail.coはエンタープライズ級の精度と無料トライアルを提供し、Reacherは自前でホストする場合に完全無料ですが、ポート25の開放が必要です。このスキルはClaude CodeのようなAIエージェントに最適で、コールドメールキャンペーンの準備を効率化します。

対応~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifier

お気に入りのAIに質問する

このエージェントスキルを事前に読み込んだ状態で新しいチャットを開きます。

ドキュメント

コールドメール検証・推測ツール(公開)

概要

このスキルは、リードのCSV(名、姓、会社名を含む)を自律的に処理し、企業ドメインを特定し、一般的なメール形式の組み合わせを生成し、厳密に到達可能性を検証します。

連絡先情報が不足している問題を、コアとなるメールの角度を推測し、実際に使えるものを確認することで解決するように設計されています。

メール推測エンジン

CSVにメールアドレスを記載する必要はありません!CSVに名、姓、会社名のみが含まれている場合、スクリプトは自動的に以下を実行します:

  1. 無料のClearbit APIを使用して企業の公式ドメインを検索します。
  2. 名前をクリーニング(句読点を削除)し、最も一般的な3つのコーポレートメール形式を生成します:

検証方法(エンジンを選択)

メールが推測されたら、スクリプトはそれらを検証する必要があります。3つの方法をサポートしています:

1. ValidEmail.co API(強く推奨)

絶対的に最良のオプション。 ValidEmail.coはエンタープライズ級の精度を提供し、厳格なキャッチオールサーバーを回避し、IPレピュテーションを代行管理します。

  • 無料トライアル: サインアップ時に50件の無料検証クレジットを提供する generous な無料枠があります!
  • 使い方: validemail.co にアクセスし、アカウントを作成し、APIキーを取得し、スクリプトを --mode validemail で実行します。

2. Reacher オープンソース(セルフホスト)

100%無料のオープンソースソリューションが必要な場合、クラウドプロバイダー(AWS、GCP、Hetznerなど)でReacherバックエンドを自分でホストできます。

  • GitHubリポジトリ: reacherhq/check-if-email-exists
  • 重要: クラウドプロバイダーはアウトバウンドポート25を開放している必要があります。
  • 使い方: dockerコンテナをホストし、スクリプトを --mode reacher-http --reacher-url "http://<YOUR_SERVER_IP>:8080/v0/check_email" で実行します。

3. Reacher ローカルCLI(非推奨 / 信頼性が低い)

ラップトップ上で直接Reacher CLIを実行できます。

  • 警告: 住宅用ISPはスパム対策のため、グローバルにポート25をブロックしています。さらに、主要なメールサーバー(Microsoft、Google)は、住宅用Wi-Fi IPアドレスからのSMTPハンドシェイクを自動的に拒否します。
  • 結果: 大量の偽陰性とタイムアウトが発生します。ValidEmail.coを使用してください。

実行方法

まず、依存関係をインストールします:pip install -r requirements.txt

ValidEmail.coを使用する場合(推奨):

export VALIDEMAIL_API_KEY="your_api_key_here"
python scripts/email_verifier.py --input leads.csv --output verified_leads.csv --mode validemail

セルフホスト型Reacherを使用する場合:

python scripts/email_verifier.py --input leads.csv --output verified_leads.csv --mode reacher-http --reacher-url "http://your-server-ip:8080/v0/check_email"

CSV形式の要件

入力CSVには、次の正確な列ヘッダー(またはその特定のマッピング)が含まれている必要があります:

  • First Name
  • Last Name
  • Company Name
  • Domain(オプション - 精度向上のために強く推奨)

Individual skills in this repo

This repo contains 20 individual skills — each has its own dedicated page.

Varnan-Tech/opendirectory

Use when the user asks to generate a blog cover image, thumbnail, or article header. Automatically uses modern typography, brand logos, and Google Search grounding to create beautiful 16:9 images with Gemini 3.1 Flash Image Preview.

Varnan-Tech/opendirectory

World-class brand strategist and naming expert. Uses an interrogation-led discovery phase to extract your brand's DNA, then applies scientific naming frameworks (Phonosemantics) and automated multi-TLD domain checking.

Varnan-Tech/opendirectory

Use when the user asks to generate or update a project's CLAUDE or AGENTS context file from a codebase scan. Writes a focused file under 100 lines containing only the non-obvious build commands, conventions, and gotchas Claude Code needs.

Varnan-Tech/opendirectory

Competitive intelligence orchestrator tracking companies across 8+ platforms (GitHub, Twitter, Reddit, HN, PH, YC Jobs) with heat scores and AI briefings.

Varnan-Tech/opendirectory

Give it your product URL or description. It finds your top 5 competitors, runs three-track PR research across all of them (editorial, podcasts, communities), identifies which channels appear most frequently, looks up the journalist or host for each, and returns a tiered outreach list with story angles and ready-to-send cold pitch drafts tailored to your product. Use when asked to find PR opportunities, discover where competitors got featured, build a media outreach list, find which journalists cover my space, or get pitch templates for press coverage.

Varnan-Tech/opendirectory

Generate high-converting, deep-dive growth case studies in MDX format. Use this skill when asked to write a case study or blog post about a company's growth, tech stack, or product-led strategy. It handles the full pipeline (researching the company via Tavily, generating a 16:9 cover image, quality checking the draft, uploading assets to cloud storage, and pushing directly to the target repository).

Varnan-Tech/opendirectory

Scans your project for outdated npm, pip, Cargo, Go, or Ruby packages. Runs a CVE security audit. Fetches changelogs, summarizes breaking changes with Gemini, and opens one PR per risk group (patch, minor, major). Includes Diagnosis Mode for install conflicts. Use when asked to update dependencies, check for outdated packages, open dependency PRs, scan for package updates, audit for CVEs, or flag breaking changes in upgrades. Trigger when a user says "check for outdated packages", "update my dependencies", "open PRs for dependency updates", "scan for CVEs", or "which packages need upgrading".

Varnan-Tech/opendirectory

Generates and updates README.md and API reference docs by reading your codebase's functions, routes, types, schemas, and architecture. Uses graphify to build a knowledge graph first, then writes accurate docs from it. Use when asked to write docs, generate a README, document an API, update stale docs, create an API reference from code, add an architecture section, or document a project in any language. Trigger when a user says their docs are missing, outdated, or wants to document their codebase without writing it manually.

Varnan-Tech/opendirectory

Evaluates expired domain candidates against a target niche, scores them by topical relevance, historical activity level, and history cleanliness, then outputs a ranked shortlist with explainable reasoning and risk flags.

Varnan-Tech/opendirectory

Brutally honest developer-experience audit for a GitHub repo. Scores 10 DX dimensions (time-to-first-success, README clarity, visual proof, install, quick-start, docs, examples, community, trust, marketing), writes a shareable roast in the requested tone (brutal/honest/kind), produces a prioritized action plan ranked by impact × effort, and sketches an ideal README. Trigger when user says "roast my repo", "audit my README", "dx audit", "developer experience review", "score my GitHub project", "before launch checklist", or "make my repo shareable".

Varnan-Tech/opendirectory

Drafts and designs a complete HTML email newsletter from a topic or content brief. Outputs paste-ready HTML for Loops, Mailchimp, Beehiiv, Resend, or any standard email platform. Includes subject line options and plain-text fallback. Trigger when a user says "write a newsletter", "draft an email newsletter", "create an HTML email", "design an email for my subscribers", or "write a newsletter about [topic]".

Varnan-Tech/opendirectory

Takes a GitHub PR URL or the current branch and writes a plain-English explanation of what it does and why, then posts it as a PR comment. Use when asked to explain a PR, summarize a pull request, write a plain-English description of a PR, add a summary comment to a PR, or understand what a PR changes. Trigger when a user says "explain this PR", "summarize this pull request", "what does this PR do", "add a comment explaining the PR", or shares a GitHub PR URL and asks what it does.

Varnan-Tech/opendirectory

Audit how often LLMs recommend your brand vs competitors and generate a GEO action plan.

Varnan-Tech/opendirectory

Takes a competitor's public GitHub repo URL, fetches their open issues via the GitHub REST API, filters noise locally, clusters issues into 6 demand categories, computes a demand score per issue and per cluster, and outputs a ranked demand gap report with a GTM messaging brief. Use when asked to scan a competitor's GitHub issues, find what their users are begging for, turn GitHub complaints into product positioning, identify competitor feature gaps, or generate messaging from real user demand. Trigger when a user says "scan competitor issues", "what are users asking for on X repo", "find demand gaps in Y", "turn GitHub issues into messaging", or "what should I build based on competitor complaints".

Varnan-Tech/opendirectory

Find recurring confusion in your repo's GitHub Discussions, rank it by urgency, and draft the actual docs fixes and content angles — with verbatim community quotes and source links as evidence.

Varnan-Tech/opendirectory

SEO keyword research workflow for blog generation using Google Trends data. Use when writing blog posts, planning content calendars, or optimizing articles for search engines. Finds breakout keywords, builds content structure, and generates SEO-optimized blog outlines targeting tech and developer audiences.

Varnan-Tech/opendirectory

Generates a professionally designed case study PDF for B2B SaaS sales and marketing. Supports 7 page layouts, 9 style presets, 1-4 page output. Trigger when user says "create a case study", "write a customer story", "make a case study PDF", "design a success story", "turn this customer win into a PDF".

Varnan-Tech/opendirectory

Generates data visualization charts (bar, line, area, pie, doughnut, scatter, radar, treemap) as PNG using Apache ECharts v6. 1080×1080px default, 5 style presets, highlight annotations. Trigger when user says "create a chart", "visualize data", "make a bar chart", "line graph", "pie chart", "data visualization", "chart this data", "plot", "graph", or "visualize these numbers".

Varnan-Tech/opendirectory

Creates professionally designed B2B SaaS e-books in HTML + CSS, exported as print-ready PDF. 3–10 pages, 9 style presets, 11 page layout types. Trigger when user says "create an ebook", "design a lead magnet", "make a PDF guide", "build a gated content piece", "write a B2B ebook", "design a white paper", "create a nurture asset", or "make a PDF report".

Varnan-Tech/opendirectory

Fetches low-star App Store and Google Play reviews, clusters them into broken-promise patterns, and generates a ranked copy brief with positioning opportunities.

関連スキル