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ClaudeChatGPTPerplexityGeminiMicrosoft CopilotRaycastMeta AIGrokZ.aiQwenKimi
DeepSeekMistralCursorVS CodeWindsurfJetBrainsClineLovableVercel AI SDKLangChain

Use Email Subject Line Optimizer with your AI.

Connect your account once and let the AI you already use work with it, without building another integration. Analyze email subject lines for spam risk, engagement potential, and display truncation.

Included with plan

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

ChatGPTClaudeCursorPerplexityGeminiMicrosoft CopilotRaycastMeta AI

Complete set · 3 capabilities

The complete Email Subject Line Optimizer capability set.

These are the exact actions your AI can choose when you ask it to work with Email Subject Line Optimizer.

Capability set01 / 01

01-03

3 capabilities in this set.

Part of 3 available through Email Subject Line Optimizer.

  1. 01

    Analyze spam risk

    Detects vocabulary and formatting patterns that trigger spam filters

  2. 02

    Predict display behavior

    Evaluates how the subject line and prehtml will appear across different mail clients

  3. 03

    Estimate engagement score

    Predicts the potential for higher open rates based on engagement drivers

Observed, not estimated

633ms average. Fast in production.

Email Subject Line Optimizer is checked daily against the live service.

Daily averagePeak 779ms
Aug 20Today
Fastest day
471ms
Slowest day
779ms
14-day trend
Slowing+30%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 3 capabilities arrive ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of Email Subject Line Optimizer, so you can see the experience inside your AI.

It does not authenticate your account with Email Subject Line Optimizer. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

Email Subject Line Optimizer Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_Y6N7kOEAtnVgLrzqqT8Bx9hVPF7rocDFnoVgxEaq/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Email Subject Line Optimizer capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "email-subject-line-optimizer-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_Y6N7kOEAtnVgLrzqqT8Bx9hVPF7rocDFnoVgxEaq/mcp"
    }
  }
}
  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Step-by-step instructions for each client are in the guide. How to connect

FAQ

Questions Email Subject Line Optimizer owners ask.

  • 01

    How does the spam risk detection work?

    The analyze_spam_risk capability scans your text against a categorized lexicon of known spam triggers, including financial, urgency, and marketing-related words. It also flags formatting issues like high ALL CAPS ratios or excessive exclamation marks.

  • 02

    Can I see how my email will look on mobile devices?

    Yes, by using the predict_display_behavior capability, you can identify exactly where your subject line and preheader text will be truncated on various clients like Gmail Mobile, Outlook Desktop, and Apple Mail iOS.

  • 03

    What factors influence the engagement score?

    The estimate_engagement_score capability calculates a score based on character length, the presence of personalization tokens, urgency markers, and emoji usage to predict how likely users are to open your email.

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