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The server translates MCP tool calls into authenticated Mailgun REST API requests, handling credential management, request serialization, and response parsing to abstract away direct API complexity.","intents":["Enable an AI agent to send transactional emails from within a multi-tool workflow","Integrate email capabilities into Claude or other MCP-compatible LLM clients without custom API wrappers","Build notification systems where LLMs trigger emails based on reasoning or decision outcomes"],"best_for":["AI agent developers building multi-step workflows that require email notifications","Teams integrating Mailgun into Claude Desktop or other MCP-aware applications","Builders prototyping LLM-driven automation that needs to communicate via email"],"limitations":["Requires valid Mailgun API key and configured sending domain — no fallback email provider support","No built-in email template rendering — templates must be pre-built in Mailgun or passed as raw HTML/text","Single-threaded request handling — high-volume email campaigns may require external queuing","No retry logic or exponential backoff — transient Mailgun API failures will propagate directly to caller"],"requires":["Node.js 16+ (MCP server runtime)","Mailgun account with API key and verified sending domain","MCP-compatible client (Claude Desktop, custom MCP host, or LLM framework with MCP support)","@iflow-mcp/mailgun-mcp-server npm package installed"],"input_types":["structured JSON (recipient email, subject, body, optional HTML, attachments metadata)","plain text (email body content)","base64-encoded binary (for attachment data)"],"output_types":["structured JSON (Mailgun response with message ID, status, timestamp)","error objects (HTTP status, error code, validation failures)"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-iflow-mcpmailgun-mcp-server__cap_1","uri":"capability://tool.use.integration.mailgun.api.credential.management.and.request.signing","name":"mailgun api credential management and request signing","description":"Manages Mailgun API authentication by securely storing and injecting API keys into outbound requests, handling OAuth/Bearer token construction and request signing according to Mailgun's REST API specification. The server abstracts credential handling so LLM agents never see raw API keys, reducing exposure surface and enabling centralized credential rotation.","intents":["Securely pass Mailgun credentials to the MCP server without exposing them to the LLM context","Rotate or update Mailgun API keys without redeploying LLM agent code","Ensure all email requests are properly authenticated and authorized by Mailgun"],"best_for":["Production deployments where credential security is non-negotiable","Multi-tenant systems where different Mailgun accounts need isolation","Teams using shared LLM infrastructure (Claude Desktop, shared MCP hosts)"],"limitations":["Credentials must be provided at server startup (environment variables or config file) — no runtime credential injection","No built-in credential rotation or expiration tracking — manual key updates required","Credentials stored in process memory — vulnerable to memory dumps if server is compromised","No audit logging of which requests used which credentials"],"requires":["Mailgun API key (private key, not public key)","Environment variable or config file to store API key securely","Node.js process isolation (containerization recommended for production)"],"input_types":["environment variables (MAILGUN_API_KEY, MAILGUN_DOMAIN)","configuration file (JSON or YAML with credentials)"],"output_types":["authenticated HTTP requests (Authorization header with Bearer token)","error responses if credentials are missing or invalid"],"categories":["tool-use-integration","safety-moderation"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-iflow-mcpmailgun-mcp-server__cap_2","uri":"capability://data.processing.analysis.email.recipient.validation.and.batch.recipient.handling","name":"email recipient validation and batch recipient handling","description":"Validates email addresses and recipient lists before sending, checking format compliance and optionally verifying against Mailgun's validation API. Supports both single-recipient and batch recipient modes, allowing agents to send to multiple recipients in a single API call or iterate over recipient lists with proper error handling per recipient.","intents":["Prevent malformed email addresses from being sent to Mailgun, reducing bounce rates","Send a single email to multiple recipients (To, Cc, Bcc) in one operation","Handle recipient list validation errors gracefully without failing the entire send operation"],"best_for":["Agents that need to validate user-provided email addresses before sending","Bulk notification systems where multiple recipients receive the same message","Systems with strict bounce-rate requirements or email deliverability standards"],"limitations":["Validation is client-side only (regex or basic format check) — does not verify mailbox existence","Batch sending is limited by Mailgun API request size (~25MB per request)","No built-in deduplication of recipient lists — duplicate emails will be sent if not pre-filtered","Cc/Bcc handling depends on Mailgun's SMTP behavior — some email clients may not respect headers"],"requires":["Valid email addresses in RFC 5322 format","Mailgun API key with email validation permissions (if using real-time validation)"],"input_types":["single email string (e.g., 'user@example.com')","array of email strings (e.g., ['user1@example.com', 'user2@example.com'])","structured recipient objects with name and email (e.g., {name: 'John', email: 'john@example.com'})"],"output_types":["validation result (valid/invalid with reason)","Mailgun send response with per-recipient status"],"categories":["data-processing-analysis","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-iflow-mcpmailgun-mcp-server__cap_3","uri":"capability://text.generation.language.email.template.and.content.composition.with.variable.substitution","name":"email template and content composition with variable substitution","description":"Supports composing email content using templates with variable substitution, allowing agents to inject dynamic data (recipient name, order ID, etc.) into pre-defined email templates. The server handles template variable parsing and replacement, supporting both simple string interpolation and Mailgun's template variables syntax for server-side rendering.","intents":["Send personalized emails with dynamic content (e.g., 'Hi {{name}}, your order {{order_id}} is ready')","Reuse email templates across multiple sends without rebuilding content each time","Leverage Mailgun's server-side template rendering for complex conditional content"],"best_for":["Transactional email systems (order confirmations, password resets, notifications)","Agents that need to personalize emails with user-specific data","Teams using Mailgun's template management features"],"limitations":["Template variables must be pre-defined — no dynamic variable discovery from data","No built-in template storage — templates must be managed in Mailgun or passed as strings","Complex conditional logic (if/else, loops) requires Mailgun's Handlebars template syntax, not all template engines supported","Variable substitution errors (missing variables) may result in literal {{variable}} text in sent emails"],"requires":["Template string with variable placeholders (e.g., '{{variable_name}}')","Data object with values for each variable","Mailgun template ID (if using server-side templates) or raw template string"],"input_types":["template string with {{variable}} placeholders","data object (JSON) with variable values","Mailgun template ID (string)"],"output_types":["rendered email content (HTML or plain text)","Mailgun send response with template rendering status"],"categories":["text-generation-language","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-iflow-mcpmailgun-mcp-server__cap_4","uri":"capability://data.processing.analysis.attachment.handling.and.multipart.mime.composition","name":"attachment handling and multipart mime composition","description":"Manages email attachments by accepting file paths or base64-encoded binary data, constructing proper MIME multipart messages, and uploading attachments to Mailgun. The server handles MIME type detection, content encoding, and attachment metadata (filename, content-disposition) according to email standards, abstracting away multipart message construction complexity.","intents":["Attach files (PDFs, images, documents) to emails sent by agents","Send generated or dynamically created files without writing to disk","Ensure attachments are properly encoded and MIME-typed for email clients"],"best_for":["Agents generating reports, invoices, or certificates that need to be emailed","Systems sending user-generated content (uploads, exports) via email","Workflows where file generation and email sending are tightly coupled"],"limitations":["Mailgun API limits attachment size to ~25MB per email — large files must be split or linked","Base64 encoding increases payload size by ~33% — large attachments may hit request size limits","No built-in file validation — agents must ensure files are safe before attaching","Attachment metadata (filename, MIME type) must be explicitly provided — no automatic detection from file paths"],"requires":["File path (local filesystem) or base64-encoded binary data","MIME type (e.g., 'application/pdf', 'image/png')","Filename for the attachment"],"input_types":["file path (string, e.g., '/path/to/file.pdf')","base64-encoded string (binary data)","attachment metadata object (filename, MIME type, content-disposition)"],"output_types":["MIME multipart message (internal representation)","Mailgun send response with attachment upload status"],"categories":["data-processing-analysis","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-iflow-mcpmailgun-mcp-server__cap_5","uri":"capability://automation.workflow.email.delivery.status.tracking.and.webhook.integration","name":"email delivery status tracking and webhook integration","description":"Integrates with Mailgun's webhook system to track email delivery events (sent, delivered, bounced, complained, unsubscribed) in real-time. The server exposes webhook endpoints that receive Mailgun event notifications and can forward them to external systems or store them for later retrieval, enabling agents to monitor email outcomes without polling the Mailgun API.","intents":["Track whether emails were successfully delivered or bounced","Detect unsubscribe requests or spam complaints for compliance","Trigger follow-up actions based on email delivery status (retry on bounce, log on delivery)"],"best_for":["Systems requiring email delivery guarantees or compliance tracking","Agents that need to react to email outcomes (e.g., retry on bounce)","High-volume email systems where polling the API is inefficient"],"limitations":["Webhooks require the MCP server to be publicly accessible with a stable URL — not suitable for local-only deployments","Webhook events are eventually consistent — there may be a delay between send and delivery notification","No built-in webhook signature verification — requires manual validation of Mailgun webhook signatures","Webhook events are not persisted by default — requires external storage to maintain delivery history"],"requires":["Mailgun webhook configuration (domain settings in Mailgun dashboard)","Public URL for the MCP server webhook endpoint","Mailgun webhook signing key for signature verification"],"input_types":["Mailgun webhook event payload (JSON with event type, message ID, timestamp, etc.)"],"output_types":["webhook acknowledgment (HTTP 200 response)","event data forwarded to external systems or stored in local cache"],"categories":["automation-workflow","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-iflow-mcpmailgun-mcp-server__cap_6","uri":"capability://tool.use.integration.mcp.resource.and.tool.schema.definition.for.email.operations","name":"mcp resource and tool schema definition for email operations","description":"Defines standardized MCP tool schemas that expose email sending, validation, and tracking operations to LLM clients. The server implements the MCP protocol's tool definition format, specifying input parameters (recipient, subject, body, etc.), output types, and error handling, allowing Claude and other MCP-compatible clients to discover and invoke email operations with full type safety and documentation.","intents":["Enable Claude to discover available email operations and their parameters","Provide type-safe tool calling with validation of input parameters before execution","Document email capabilities in a machine-readable format for LLM clients"],"best_for":["Developers integrating the MCP server with Claude Desktop or other MCP hosts","Teams building LLM agents that need discoverable, well-documented tool interfaces","Systems requiring strict input validation before executing email operations"],"limitations":["Schema definitions are static — cannot be dynamically generated based on Mailgun account configuration","MCP protocol version compatibility must be maintained — schema changes may break older clients","Complex nested schemas (e.g., deeply nested recipient objects) may be difficult to express in MCP format","No built-in schema versioning — breaking changes require coordinated client/server updates"],"requires":["MCP-compatible client (Claude Desktop, custom MCP host, etc.)","MCP protocol version 1.0 or later"],"input_types":["MCP tool definition schema (JSON following MCP specification)"],"output_types":["MCP tool schema exposed to client","tool call results with structured response format"],"categories":["tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":25,"verified":false,"data_access_risk":"high","permissions":["Node.js 16+ (MCP server runtime)","Mailgun account with API key and verified sending domain","MCP-compatible client (Claude Desktop, custom MCP host, or LLM framework with MCP support)","@iflow-mcp/mailgun-mcp-server npm package installed","Mailgun API key (private key, not public key)","Environment variable or config file to store API key securely","Node.js process isolation (containerization recommended for production)","Valid email addresses in RFC 5322 format","Mailgun API key with email validation permissions (if using real-time validation)","Template string with variable placeholders (e.g., '{{variable_name}}')"],"failure_modes":["Requires valid Mailgun API key and configured sending domain — no fallback email provider support","No built-in email template rendering — templates must be pre-built in Mailgun or passed as raw HTML/text","Single-threaded request handling — high-volume email campaigns may require external queuing","No retry logic or exponential backoff — transient Mailgun API failures will propagate directly to caller","Credentials must be provided at server startup (environment variables or config file) — no runtime credential injection","No built-in credential rotation or expiration tracking — manual key updates required","Credentials stored in process memory — vulnerable to memory dumps if server is compromised","No audit logging of which requests used which credentials","Validation is client-side only (regex or basic format check) — does not verify mailbox existence","Batch sending is limited by Mailgun API request size (~25MB per request)","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.24,"ecosystem":0.3,"match_graph":0.25,"freshness":0.6,"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":"2026-05-24T12:16:23.903Z","last_scraped_at":"2026-05-03T14:23:46.717Z","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=npm-iflow-mcpmailgun-mcp-server","compare_url":"https://unfragile.ai/compare?artifact=npm-iflow-mcpmailgun-mcp-server"}},"signature":"nq7ZOP3OsGbTSlVDxC+qYIY0CFMXapTG7+ZXvAMKBKzpLk+vXS3/BH6Nt7EfomE06nomEATACD6LyLtb2nPzBw==","signedAt":"2026-06-22T02:22:16.696Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/npm-iflow-mcpmailgun-mcp-server","artifact":"https://unfragile.ai/npm-iflow-mcpmailgun-mcp-server","verify":"https://unfragile.ai/api/v1/verify?slug=npm-iflow-mcpmailgun-mcp-server","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"}}