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MailFixture — Email & SMS Testing MCP for Automated QA

Disposable email and SMS inboxes for AI agent testing. MailFixture provides receive-only inboxes that AI agents can use to complete email/SMS verification flows during automated testing. Wait-for-OTP and wait-for-link tools eliminate the manual verification step.

What It Does for Operators

  • Receive-only inboxes — Temporary email and SMS addresses for testing
  • Wait-for-OTP — AI agent polls inbox until verification code arrives, then returns it
  • Wait-for-link — AI agent polls inbox for magic link, then returns it
  • No setup — Inboxes created on demand through MCP tools
  • Agent-native testing — Complete end-to-end signup flows without human intervention

Installation

# No installation — hosted API
# Sign up at mailfixture.com for API key

Claude Desktop / Hermes Config

{
  "mcpServers": {
    "mailfixture": {
      "type": "url",
      "url": "https://mailfixture.com/docs/mcp"
    }
  }
}

Key Tools

Tool Description
create_inbox Generate a disposable email or SMS inbox
wait_for_otp Poll inbox until OTP arrives, return the code
wait_for_link Poll inbox until magic link arrives, return the URL
get_messages List all messages received at inbox
delete_inbox Clean up temporary inbox

Note: Tool names are approximate. Full documentation at mailfixture.com/docs/mcp.

Operator Use Cases

  1. QA Automation — End-to-end signup flow testing without manual email verification
  2. CI/CD Pipelines — Automated integration tests that complete OAuth and email verification
  3. Developer Tools — Test password reset, email confirmation, and 2FA flows programmatically
  4. Agent Development — Build and test AI agents that interact with email-based workflows

CorpusIQ Angle

MailFixture solves a key testing pain point for operators building on CorpusIQ: automated end-to-end testing of OAuth and email verification flows. For operators integrating CorpusIQ with their own applications, MailFixture enables CI pipelines that fully test the signup → OAuth → email verification → data access flow.

Limitations

  • Receive-only (cannot send emails)
  • Temporary inboxes (not for production use)
  • SMS coverage may be limited by country
  • Rate limits for free tier