{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"awesome-email","slug":"email","name":"Email","type":"mcp","url":"https://github.com/Shy2593666979/mcp-server-email","page_url":"https://unfragile.ai/email","categories":["mcp-servers"],"tags":[],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"awesome-email__cap_0","uri":"capability://tool.use.integration.multi.provider.smtp.email.sending.with.environment.based.credential.management","name":"multi-provider smtp email sending with environment-based credential management","description":"Sends emails through 9 pre-configured SMTP providers (Gmail, Outlook, Yahoo, QQ, 163, 126, Sina, Sohu, Aliyun) by resolving provider configurations from a static email.json file and loading credentials from environment variables. The implementation uses Python's smtplib with TLS/SSL encryption, supporting both single and multiple recipients with HTML/plain-text content negotiation. Credentials are never hardcoded; instead, the system expects environment variables named after the provider (e.g., GMAIL_PASSWORD, QQ_MAIL_PASSWORD) to be pre-loaded before server startup.","intents":["Send transactional emails from an LLM agent to multiple recipients without managing SMTP configuration","Integrate email delivery into AI workflows while keeping credentials secure via environment variables","Support users across different email providers (Gmail, Outlook, Chinese services) from a single MCP interface","Enable Claude or other LLMs to compose and dispatch emails with dynamic content"],"best_for":["LLM application developers building AI agents that need email capabilities","Teams deploying Claude Desktop integrations requiring email automation","Multi-region deployments supporting both Western (Gmail, Outlook) and Chinese (QQ, 163) email services"],"limitations":["Provider list is static and hardcoded in email.json — adding new SMTP providers requires code modification","No built-in retry logic or exponential backoff for transient SMTP failures","Credentials must be pre-loaded as environment variables before server startup; no runtime credential injection","No support for OAuth2 or modern authentication methods — relies on SMTP username/password only","Single-threaded SMTP operations — concurrent email sends will block sequentially"],"requires":["Python 3.10+","Environment variables set for each provider (e.g., GMAIL_EMAIL, GMAIL_PASSWORD)","Valid SMTP credentials for at least one configured provider","Network access to SMTP servers (ports 587 or 465 depending on provider)","MCP client capable of calling tools (e.g., Claude Desktop, custom MCPClient)"],"input_types":["JSON object with fields: provider (string), to (string or array), subject (string), body (string), attachments (optional array of file paths)"],"output_types":["JSON response with success status and message ID or error details"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_1","uri":"capability://search.retrieval.file.system.attachment.search.with.pattern.matching","name":"file-system attachment search with pattern matching","description":"Searches a designated directory (specified via CLI --dir argument or environment variable) for files matching text patterns, enabling LLMs to discover and reference attachments before composing emails. The implementation uses Python's pathlib and fnmatch for recursive directory traversal and glob-style pattern matching, returning file paths and metadata (size, modification time) that can be passed to the send_email tool. The search directory is configurable at server startup and enforced as a security boundary to prevent directory traversal attacks.","intents":["Discover available files in a specific directory before attaching them to emails","Enable Claude to search for documents, reports, or images by filename pattern before sending","Provide file metadata (size, path) to help LLMs decide which attachments to include","Implement a secure, sandboxed file access pattern that restricts attachment sources to a single directory"],"best_for":["LLM agents that need to dynamically select attachments based on user requests","Workflows where attachment availability changes frequently and must be discovered at runtime","Security-conscious deployments requiring strict file access boundaries"],"limitations":["Search is limited to a single directory tree — cannot search across multiple attachment directories","Pattern matching uses fnmatch (shell-style wildcards) — no regex support for complex patterns","No full-text search of file contents — only filename matching is supported","Large directories (10k+ files) may cause noticeable latency in search operations","No caching of directory listings — each search performs a fresh filesystem traversal"],"requires":["Python 3.10+","CLI argument --dir or environment variable specifying the attachment directory","Read permissions on the target directory and all subdirectories","MCP client capable of calling tools"],"input_types":["JSON object with fields: pattern (string, fnmatch-style wildcard), directory (optional, defaults to configured --dir)"],"output_types":["JSON array of objects containing: path (string), size (integer bytes), modified_time (ISO 8601 timestamp)"],"categories":["search-retrieval","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_2","uri":"capability://tool.use.integration.mcp.protocol.tool.exposure.via.dual.server.implementations","name":"mcp protocol tool exposure via dual server implementations","description":"Exposes email and attachment-search capabilities through the Model Context Protocol (MCP) using two parallel server implementations: a standard MCP server (using mcp library) and a FastMCP variant (using fastmcp library). Both implementations expose identical tool definitions (list_tools, call_tool) and handle request/response serialization according to the MCP specification. The dual implementation pattern demonstrates different architectural approaches while maintaining API compatibility, allowing clients to choose based on performance or dependency preferences.","intents":["Integrate email capabilities into Claude Desktop or other MCP-compatible LLM clients","Enable LLMs to discover available email and attachment-search tools via MCP protocol","Provide a standardized interface for tool invocation that works across different MCP client implementations","Demonstrate MCP server implementation patterns for developers building custom tool servers"],"best_for":["Claude Desktop users wanting to add email capabilities to their AI workflows","Developers building custom MCP clients that need email integration","Teams evaluating MCP server implementation patterns (standard vs FastMCP)"],"limitations":["MCP protocol is relatively new — client support is limited to Claude Desktop, custom MCPClient implementations, and a few other tools","Dual implementation adds maintenance burden — bug fixes must be applied to both server variants","No built-in authentication or authorization — assumes the MCP client is trusted","Tool definitions are static and must be manually updated if new parameters are added","No streaming support for long-running operations — all tool calls are request/response synchronous"],"requires":["Python 3.10+","mcp library (for standard server) or fastmcp library (for FastMCP variant)","MCP-compatible client (Claude Desktop, custom MCPClient, etc.)","stdio transport for server-client communication"],"input_types":["MCP tool call requests with JSON-serialized arguments"],"output_types":["MCP tool call responses with JSON-serialized results or error messages"],"categories":["tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_3","uri":"capability://automation.workflow.environment.variable.based.configuration.with.multi.source.fallback","name":"environment-variable-based configuration with multi-source fallback","description":"Loads email provider credentials and server configuration from environment variables with a multi-source fallback pattern: CLI arguments (highest priority) override environment variables, which override defaults from email.json. Provider configurations (SMTP host, port, TLS settings) are stored in a static email.json file, while credentials (username, password) are loaded from environment variables named after the provider (e.g., GMAIL_EMAIL, GMAIL_PASSWORD). The attachment directory can be specified via --dir CLI argument or ATTACHMENT_DIR environment variable. This pattern separates configuration (static) from secrets (dynamic) and enables secure deployment without embedding credentials in code or configuration files.","intents":["Configure email providers and credentials securely without hardcoding secrets","Support different configurations across development, staging, and production environments via environment variables","Allow CLI overrides for one-off configuration changes without modifying environment setup","Enable Docker and cloud deployments where environment variables are the standard configuration mechanism"],"best_for":["DevOps teams deploying MCP servers in containerized environments (Docker, Kubernetes)","Organizations with strict secrets management policies requiring environment-variable-based credential injection","Multi-environment deployments (dev/staging/prod) with different email provider credentials per environment"],"limitations":["Configuration is read at server startup — changes to environment variables require server restart","No runtime configuration API — cannot update credentials or provider settings without restarting","Provider list is hardcoded in email.json — adding new providers requires code changes","No validation of environment variables at startup — missing credentials will only be discovered when send_email is called","CLI arguments are positional and limited — complex configurations are better handled via environment variables"],"requires":["Python 3.10+","email.json file in the package (defines provider SMTP configurations)","Environment variables set for each provider (e.g., GMAIL_EMAIL, GMAIL_PASSWORD)","Optional: --dir CLI argument for specifying attachment directory"],"input_types":["Environment variables (string key-value pairs)","CLI arguments (--dir string)"],"output_types":["Resolved configuration dictionary with provider settings and credentials"],"categories":["automation-workflow","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_4","uri":"capability://safety.moderation.pydantic.based.request.validation.for.email.messages","name":"pydantic-based request validation for email messages","description":"Validates incoming email requests using Pydantic models (EmailMessage) that enforce type checking, required field validation, and optional field handling before passing data to SMTP operations. The validation layer catches malformed requests (missing recipients, invalid email addresses, oversized payloads) at the MCP tool boundary, preventing invalid data from reaching SMTP operations and providing clear error messages to clients. Pydantic's JSON schema generation also enables automatic tool definition generation for MCP clients.","intents":["Prevent malformed email requests from reaching SMTP operations","Provide clear validation error messages to LLM clients when email parameters are invalid","Automatically generate JSON schema for tool definitions from Pydantic models","Enforce type safety and required field constraints without manual validation code"],"best_for":["MCP server implementations requiring strict input validation","Teams using Pydantic for API validation across their stack","Deployments where clear error messages to LLM clients are critical for debugging"],"limitations":["Pydantic validation adds ~5-10ms overhead per request","No custom validation rules beyond type checking and required fields — complex business logic validation must be implemented separately","Error messages are technical and may not be user-friendly for non-technical LLM users","No rate limiting or quota enforcement at the validation layer"],"requires":["Python 3.10+","Pydantic library (included in dependencies)"],"input_types":["JSON object with email message fields"],"output_types":["Validated EmailMessage object or Pydantic ValidationError"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_5","uri":"capability://tool.use.integration.stdio.based.mcp.server.transport.with.standard.fastmcp.variants","name":"stdio-based mcp server transport with standard/fastmcp variants","description":"Implements MCP server communication over stdin/stdout using either the standard mcp library or the fastmcp library, both of which handle JSON-RPC message serialization, request routing, and response formatting according to the MCP specification. The stdio transport enables the server to run as a subprocess of MCP clients (Claude Desktop, custom MCPClient), with all communication flowing through standard input/output streams. The dual implementation pattern (standard vs FastMCP) allows clients to choose between different performance characteristics and dependency footprints.","intents":["Enable MCP clients to spawn the email server as a subprocess and communicate via stdio","Provide transparent JSON-RPC message handling without requiring clients to implement MCP protocol details","Support both standard mcp and fastmcp libraries for different deployment scenarios","Enable local, secure communication between LLM clients and email server without network exposure"],"best_for":["Claude Desktop integrations where stdio transport is the standard communication mechanism","Local development environments where subprocess-based servers are preferred","Deployments requiring secure, local-only communication without network exposure"],"limitations":["stdio transport is synchronous — cannot handle concurrent requests from multiple clients","No built-in load balancing or horizontal scaling — each client needs its own server instance","Debugging stdio-based communication requires special tools (e.g., logging to stderr)","No persistent connection — each request/response cycle is independent","Limited to local communication — cannot be exposed over network without additional infrastructure"],"requires":["Python 3.10+","mcp library (for standard server) or fastmcp library (for FastMCP variant)","MCP client capable of spawning subprocesses (Claude Desktop, custom MCPClient)"],"input_types":["JSON-RPC messages on stdin"],"output_types":["JSON-RPC responses on stdout"],"categories":["tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_6","uri":"capability://safety.moderation.attachment.file.validation.and.path.sanitization","name":"attachment file validation and path sanitization","description":"Validates attachment file paths before including them in emails by checking that files exist within the configured attachment directory, preventing directory traversal attacks and unauthorized file access. The implementation uses pathlib to resolve absolute paths and verify that resolved paths are within the allowed directory boundary. Files are validated at email send time, and only files within the configured directory tree are permitted; attempts to attach files outside this boundary are rejected with clear error messages.","intents":["Prevent LLM agents from accessing files outside the designated attachment directory","Validate that attachment files exist before attempting to include them in emails","Provide clear error messages when attachment paths are invalid or outside the allowed boundary","Implement a security boundary that restricts file access to a single directory tree"],"best_for":["Multi-tenant deployments where file access must be strictly isolated per user or workspace","Security-conscious environments requiring strict file access controls","Deployments where LLM agents have limited trust and must be sandboxed"],"limitations":["Validation is performed at email send time — invalid paths are not discovered during attachment search","No support for symbolic links or other filesystem features that might bypass path validation","Error messages may leak information about directory structure if not carefully handled","No support for relative paths — all paths must be resolvable within the attachment directory"],"requires":["Python 3.10+","Valid attachment directory specified via --dir or environment variable","Read permissions on attachment files"],"input_types":["File paths (string) in email attachment requests"],"output_types":["Validation success (file included in email) or error message (path rejected)"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_7","uri":"capability://safety.moderation.tls.ssl.encryption.for.smtp.connections","name":"tls/ssl encryption for smtp connections","description":"Establishes encrypted SMTP connections using TLS (port 587) or SSL (port 465) based on provider configuration, protecting email credentials and message content in transit. The implementation uses Python's smtplib with starttls() or implicit SSL, with provider-specific port and encryption settings defined in email.json. Certificate validation is performed by default, preventing man-in-the-middle attacks on SMTP connections.","intents":["Protect email credentials from interception during SMTP authentication","Encrypt email content in transit between the server and SMTP providers","Ensure compliance with security standards requiring encrypted email transmission","Support both TLS and SSL encryption methods for different SMTP providers"],"best_for":["Production deployments requiring encrypted email transmission","Compliance-sensitive environments (healthcare, finance) with encryption requirements","Deployments using public networks or untrusted network paths"],"limitations":["Certificate validation cannot be disabled — self-signed certificates will fail","No support for certificate pinning or custom certificate validation logic","TLS/SSL handshake adds ~100-200ms latency per email send","Provider SMTP servers must support TLS 1.2+ — older servers may not be compatible"],"requires":["Python 3.10+","Network access to SMTP servers on ports 587 (TLS) or 465 (SSL)","Valid SSL certificates on SMTP servers (self-signed certificates not supported)"],"input_types":["Provider configuration specifying encryption method (TLS or SSL)"],"output_types":["Encrypted SMTP connection or connection error"],"categories":["safety-moderation","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-email__cap_8","uri":"capability://automation.workflow.cli.argument.parsing.for.server.configuration","name":"cli argument parsing for server configuration","description":"Parses command-line arguments (--dir for attachment directory) using Python's argparse module, enabling users to configure the server at startup without modifying environment variables or code. CLI arguments take precedence over environment variables and defaults, allowing one-off configuration overrides. The parser provides help text and validates argument types before server initialization.","intents":["Configure the attachment directory at server startup without modifying environment variables","Enable different attachment directories for different server instances","Provide a user-friendly interface for server configuration","Support scripted server startup with configuration parameters"],"best_for":["Local development where configuration changes are frequent","Scripted deployments where configuration is passed as command-line arguments","Users preferring CLI configuration over environment variables"],"limitations":["CLI argument parsing is limited to simple string arguments — complex configurations are better handled via environment variables","No validation of argument values — invalid paths are only discovered at runtime","Help text is minimal — users must refer to documentation for detailed configuration options","No support for configuration files — only CLI arguments and environment variables are supported"],"requires":["Python 3.10+","argparse module (standard library)"],"input_types":["CLI arguments (--dir string)"],"output_types":["Parsed configuration dictionary"],"categories":["automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":30,"verified":false,"data_access_risk":"high","permissions":["Python 3.10+","Environment variables set for each provider (e.g., GMAIL_EMAIL, GMAIL_PASSWORD)","Valid SMTP credentials for at least one configured provider","Network access to SMTP servers (ports 587 or 465 depending on provider)","MCP client capable of calling tools (e.g., Claude Desktop, custom MCPClient)","CLI argument --dir or environment variable specifying the attachment directory","Read permissions on the target directory and all subdirectories","MCP client capable of calling tools","mcp library (for standard server) or fastmcp library (for FastMCP variant)","MCP-compatible client (Claude Desktop, custom MCPClient, etc.)"],"failure_modes":["Provider list is static and hardcoded in email.json — adding new SMTP providers requires code modification","No built-in retry logic or exponential backoff for transient SMTP failures","Credentials must be pre-loaded as environment variables before server startup; no runtime credential injection","No support for OAuth2 or modern authentication methods — relies on SMTP username/password only","Single-threaded SMTP operations — concurrent email sends will block sequentially","Search is limited to a single directory tree — cannot search across multiple attachment directories","Pattern matching uses fnmatch (shell-style wildcards) — no regex support for complex patterns","No full-text search of file contents — only filename matching is supported","Large directories (10k+ files) may cause noticeable latency in search operations","No caching of directory listings — each search performs a fresh filesystem traversal","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.43,"ecosystem":0.39999999999999997,"match_graph":0.25,"freshness":0.52,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-06-17T09:51:03.039Z","last_scraped_at":"2026-05-03T14:00:15.503Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=email","compare_url":"https://unfragile.ai/compare?artifact=email"}},"signature":"nAye6IBqbgdFX32zMQFl/BumeQhqNxuYsmM9RsmWrun5dyLuc36v7lv35M0gG2b3JloyqSDhA6vaNBPWXiZ3CA==","signedAt":"2026-06-22T06:34:43.493Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/email","artifact":"https://unfragile.ai/email","verify":"https://unfragile.ai/api/v1/verify?slug=email","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}