generated: '2026-08-13'
method: probed
source: live GET of /.well-known/* on every MailerSend host in apis.yml + OpenAPI servers[]
notes: >-
  Two real documents are served, both by the MCP host: RFC 8414 authorization-server metadata and
  RFC 9728 protected-resource metadata. The API host (api.mailersend.com) answers 403 on every
  /.well-known/* path, the docs host answers 404 (Next.js error shell), and the marketing host
  (www.mailersend.com) is behind a Cloudflare bot challenge that returned 429 to every automated
  request in this pass — so its /.well-known/ surface is unknown, not proven absent.
hosts:
  - host: https://mcp.mailersend.com
    documents:
      - path: /.well-known/oauth-authorization-server
        status: 200
        content_type: application/json
        file: mailersend-oauth-authorization-server.json
      - path: /.well-known/oauth-protected-resource
        status: 200
        content_type: application/json
        file: mailersend-oauth-protected-resource.json
      - path: /.well-known/security.txt
        status: 404
      - path: /.well-known/openid-configuration
        status: 404
      - path: /.well-known/api-catalog
        status: 404
      - path: /.well-known/ai-plugin.json
        status: 404
      - path: /.well-known/agent-card.json
        status: 404
      - path: /.well-known/agent.json
        status: 404
  - host: https://api.mailersend.com
    documents:
      - path: /.well-known/security.txt
        status: 403
      - path: /.well-known/openid-configuration
        status: 403
      - path: /.well-known/oauth-authorization-server
        status: 403
      - path: /.well-known/oauth-protected-resource
        status: 403
      - path: /.well-known/api-catalog
        status: 403
      - path: /.well-known/ai-plugin.json
        status: 403
      - path: /.well-known/agent-card.json
        status: 403
      - path: /.well-known/agent.json
        status: 403
  - host: https://developers.mailersend.com
    documents:
      - path: /.well-known/security.txt
        status: 404
      - path: /.well-known/openid-configuration
        status: 404
      - path: /.well-known/oauth-authorization-server
        status: 404
      - path: /.well-known/oauth-protected-resource
        status: 404
      - path: /.well-known/api-catalog
        status: 404
      - path: /.well-known/ai-plugin.json
        status: 404
      - path: /.well-known/agent-card.json
        status: 404
      - path: /.well-known/agent.json
        status: 404
  - host: https://www.mailersend.com
    unreadable: true
    reason: >-
      Cloudflare interstitial ("Just a moment...") returned HTTP 429 with an HTML challenge body on
      every path, including /robots.txt. No /.well-known/ conclusion can be drawn for this host.
    documents:
      - path: /.well-known/security.txt
        status: 429
      - path: /.well-known/openid-configuration
        status: 429
      - path: /.well-known/oauth-authorization-server
        status: 429
      - path: /.well-known/oauth-protected-resource
        status: 429
      - path: /.well-known/api-catalog
        status: 429
      - path: /.well-known/ai-plugin.json
        status: 429
      - path: /.well-known/agent-card.json
        status: 429
      - path: /.well-known/agent.json
        status: 429
security_txt: false
agent_card: false