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Dimensione2a MCP ServerAuthenticated email gateway for AI agentsMartinLoop MCP ServerAn independent control layer that gives AI coding agents budgets, brakes, and receipts
FMRS42 / 100 · D79 / 100 · B
Reliability4 / 2012 / 20
Security and permissions5 / 2018 / 20
Maintenance8 / 2016 / 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
  • Engineering teams scaling AI coding agents while controlling spend
  • Platform teams that need auditable, rollback-aware agent execution records
  • Organizations using multiple agents (Claude, Codex, Gemini) under one governed flow
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
  • Developers who just want a simple code-completion helper without run governance
  • Teams unwilling to accept local JSONL run records with HMAC signing
  • Environments without a supported adapter (Claude/Codex/Gemini CLIs, direct provider, or verifier-only)
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
  • Read/write access to the configured repo root (writable scope restrictable via --allow-path/--deny-path)
  • Ability to invoke the chosen agent CLI (Claude/Codex/Gemini, etc.) and its underlying model account
  • Local disk writes for run records, receipts, and share outputs (share/run-receipt., etc.)
  • Execution of user-configured verifier commands (e.g. npm test)
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
  • Verifier commands are executed; poorly chosen verifier commands carry security risk despite preflight policy checks
  • Cost and token figures may be estimates (labeled with provenance) and should not be treated as settled accounting
  • Receipt integrity must be verified before use as trustworthy evidence; missing rollback evidence is flagged as EVIDENCE_BOUNDARY
  • Policy defaults come from martin.config.yaml and can be overridden by CLI flags; misconfiguration can loosen safety boundaries
Supported clientsClaude Desktop, Cursor, Cline, Google ADK, LangChain, OpenAI Agents SDK, Zed, Goose, WindsurfClaude Code, Codex, Gemini CLI, Cursor, VS Code, GitHub Copilot, Continue
Tools140