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Dimensione2a MCP ServerAuthenticated email gateway for AI agentsNPM Sentinel MCP ServerAI-powered NPM package analysis MCP server
FMRS42 / 100 · D79 / 100 · B
Reliability4 / 2012 / 20
Security and permissions5 / 2016 / 20
Maintenance8 / 2018 / 20
Documentation13 / 2018 / 20
Setup experience12 / 2015 / 20
Best for
  • Developers building AI agents that need to communicate with humans or other agents
  • Teams that need to receive email from behind firewalls or on laptops without public URLs
  • Use cases requiring authenticated email delivery (SPF/DKIM/DMARC)
  • Organizations that want to review outbound email before sending
  • Developers auditing NPM dependencies within AI workflows
  • Teams performing supply chain security assessments
  • Users of Claude Desktop, Cursor, or VS Code
Not for
  • Users who need a full MTA like Postfix or Postal
  • Users who only need simple email sending without external dependencies
  • Scenarios requiring advanced deliverability management like bounce handling and analytics
  • Projects outside the NPM ecosystem (e.g., pure Python/Go)
  • Environments without network access to deps.dev, OSV.dev, and the npm registry
  • Scenarios requiring maintenance by an official upstream vendor
Required permissions
  • Read and send email
  • Manage agents, domains, and webhooks
  • Manage human approvals (approve/reject)
  • Requires API key or OAuth authorization
  • Requires DNS TXT verification for custom domains
  • Network access to the NPM registry and external services (deps.dev, OSV.dev, OpenSSF, npms.io, GitHub)
  • Read access to workspace lockfiles (pnpm-lock.yaml, package-lock., yarn.lock) for cache invalidation
Risks and side effects
  • Misuse of API keys could lead to unauthorized email access
  • Inbound emails may contain prompt injection or phishing attempts
  • Improper webhook signature verification could be spoofed
  • Dependency on external service availability
  • Third-party READMEs and changelogs are untrusted external content; they are wrapped in tags with _meta flags but should still be handled cautiously
  • Depends on availability and accuracy of external services
  • Batch requests are capped at 25 packages to prevent registry enumeration; larger sets require batching
  • Third-party open source project, not officially maintained by NPM or Anthropic
Supported clientsClaude Desktop, Cursor, Cline, Google ADK, LangChain, OpenAI Agents SDK, Zed, Goose, WindsurfClaude Desktop, VS Code, Cursor
Tools1419