@iflow-mcp/mailgun-mcp-server

Q: What can @iflow-mcp/mailgun-mcp-server do?

mcp-compliant email sending via mailgun api, mailgun api credential management and request signing, email recipient validation and batch recipient handling, email template and content composition with variable substitution, attachment handling and multipart mime composition, email delivery status tracking and webhook integration, mcp resource and tool schema definition for email operations

MCP ServerFree

[![MCP](https://img.shields.io/badge/MCP-Server-blue.svg)](https://github.com/modelcontextprotocol)

Open Source

/ 100

7 capabilities

Capabilities7 decomposed

mcp-compliant email sending via mailgun api

Medium confidence

Exposes Mailgun's email transmission API through the Model Context Protocol (MCP) server interface, allowing LLM agents and tools to send emails by invoking standardized MCP resources. 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.

Solves for

Enable an AI agent to send transactional emails from within a multi-tool workflowIntegrate email capabilities into Claude or other MCP-compatible LLM clients without custom API wrappersBuild 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

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)

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

What makes it unique

Implements MCP server pattern specifically for Mailgun, providing standardized tool-calling interface that integrates directly with Claude and other MCP hosts without requiring custom API client code or authentication handling in the LLM context

vs alternatives

Simpler than building custom Mailgun integrations for each LLM framework because it uses the standardized MCP protocol, enabling reuse across Claude, Cline, and other MCP-compatible tools

mailgun api credential management and request signing

Medium confidence

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.

Solves for

Securely pass Mailgun credentials to the MCP server without exposing them to the LLM contextRotate or update Mailgun API keys without redeploying LLM agent codeEnsure 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)

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)

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

What makes it unique

Centralizes Mailgun credential management at the MCP server layer, preventing API keys from being exposed to LLM context or stored in agent memory, using environment-based injection pattern standard in containerized deployments

vs alternatives

More secure than passing Mailgun credentials directly to LLM agents because credentials never enter the LLM context, reducing risk of accidental exposure in logs or model outputs

email recipient validation and batch recipient handling

Medium confidence

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.

Solves for

Prevent malformed email addresses from being sent to Mailgun, reducing bounce ratesSend a single email to multiple recipients (To, Cc, Bcc) in one operationHandle 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

Requires

Valid email addresses in RFC 5322 format

Mailgun API key with email validation permissions (if using real-time validation)

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

What makes it unique

Implements client-side email validation before Mailgun API calls, reducing rejected requests and API quota waste, with support for both single and batch recipient modes through a unified interface

vs alternatives

Reduces Mailgun API failures and bounce rates compared to sending unvalidated addresses directly, because validation happens before the request reaches Mailgun's servers

email template and content composition with variable substitution

Medium confidence

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.

Solves for

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 timeLeverage 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

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

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

What makes it unique

Bridges client-side variable substitution with Mailgun's server-side template rendering, allowing agents to use either approach depending on complexity, with fallback to simple string interpolation for basic use cases

vs alternatives

More flexible than hardcoding email content because templates are reusable and support dynamic personalization, and more reliable than client-side rendering because Mailgun handles server-side template logic

attachment handling and multipart mime composition

Medium confidence

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.

Solves for

Attach files (PDFs, images, documents) to emails sent by agentsSend generated or dynamically created files without writing to diskEnsure 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

Requires

File path (local filesystem) or base64-encoded binary data

MIME type (e.g., 'application/pdf', 'image/png')

Filename for the attachment

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

What makes it unique

Abstracts MIME multipart message construction and attachment encoding, allowing agents to attach files by simply providing paths or binary data without understanding email standards or base64 encoding

vs alternatives

Simpler than manually constructing MIME messages because the server handles encoding and metadata, and more reliable than raw Mailgun API calls because it validates attachment format before sending

email delivery status tracking and webhook integration

Medium confidence

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.

Solves for

Track whether emails were successfully delivered or bouncedDetect unsubscribe requests or spam complaints for complianceTrigger 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

Requires

Mailgun webhook configuration (domain settings in Mailgun dashboard)

Public URL for the MCP server webhook endpoint

Mailgun webhook signing key for signature verification

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

What makes it unique

Implements webhook-based event streaming from Mailgun, allowing agents to react to delivery events in real-time without polling, with optional event persistence and forwarding to external systems

vs alternatives

More efficient than polling Mailgun's API for delivery status because webhooks push events to the server, reducing latency and API quota usage

mcp resource and tool schema definition for email operations

Medium confidence

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.

Solves for

Enable Claude to discover available email operations and their parametersProvide type-safe tool calling with validation of input parameters before executionDocument 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

Requires

MCP-compatible client (Claude Desktop, custom MCP host, etc.)

MCP protocol version 1.0 or later

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

What makes it unique

Implements MCP protocol's tool schema definition pattern, providing Claude and other clients with discoverable, type-safe email operations without requiring manual API documentation or custom client code

vs alternatives

More discoverable and type-safe than raw API documentation because MCP schema is machine-readable and enables IDE-like autocomplete in LLM clients

Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.

Related Artifactssharing capabilities

Artifacts that share capabilities with @iflow-mcp/mailgun-mcp-server, ranked by overlap. Discovered automatically through the match graph.

MCP Server21

Mailgun

** - Interact with Mailgun API.

email sending via smtp relay with domain validationbatch email sending with template renderingemail validation and list hygienemailing list management and subscriber operations

4 shared capabilities

MCP Server44

@gongrzhe/server-gmail-autoauth-mcp

Gmail MCP server with auto authentication support

gmail message composition and sendingmcp tool schema definition and invocationgmail draft management and editing

3 shared capabilities

MCP Server27

@cardor/email-management

A Node.js application for managing email workflows using the ModelContextProtocol (MCP).

email send operation with mcp tool schemamcp-based email server integrationemail provider abstraction layer

3 shared capabilities

MCP Server30

agentmail-mcp

AgentMail MCP Server

mcp-protocol-compliance-and-resource-managementemail-account-connection-via-mcp

2 shared capabilities

MCP Server20

Email Send MCP

** - A fixed one from above one. More user-friendly.

smtp-based email sending via mcp protocolmulti-recipient email composition with header management

2 shared capabilities

MCP Server22

Mailtrap

** - Integrates with Mailtrap Email API.

mailtrap api authentication and credential managementemail sandbox inbox management via mcp protocol

2 shared capabilities

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
✓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)
✓Agents that need to validate user-provided email addresses before sending
✓Bulk notification systems where multiple recipients receive the same message

Known 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
⚠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

Requirements

Node.js 16+ (MCP server runtime)Mailgun account with API key and verified sending domainMCP-compatible client (Claude Desktop, custom MCP host, or LLM framework with MCP support)@iflow-mcp/mailgun-mcp-server npm package installedMailgun API key (private key, not public key)Environment variable or config file to store API key securelyNode.js process isolation (containerization recommended for production)Valid email addresses in RFC 5322 format

Input / Output

Accepts: structured JSON (recipient email, subject, body, optional HTML, attachments metadata), plain text (email body content), base64-encoded binary (for attachment data), environment variables (MAILGUN_API_KEY, MAILGUN_DOMAIN), configuration file (JSON or YAML with credentials), 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'}), template string with {{variable}} placeholders, data object (JSON) with variable values, Mailgun template ID (string), file path (string, e.g., '/path/to/file.pdf'), base64-encoded string (binary data), attachment metadata object (filename, MIME type, content-disposition), Mailgun webhook event payload (JSON with event type, message ID, timestamp, etc.), MCP tool definition schema (JSON following MCP specification)

Produces: structured JSON (Mailgun response with message ID, status, timestamp), error objects (HTTP status, error code, validation failures), authenticated HTTP requests (Authorization header with Bearer token), error responses if credentials are missing or invalid, validation result (valid/invalid with reason), Mailgun send response with per-recipient status, rendered email content (HTML or plain text), Mailgun send response with template rendering status, MIME multipart message (internal representation), Mailgun send response with attachment upload status, webhook acknowledgment (HTTP 200 response), event data forwarded to external systems or stored in local cache, MCP tool schema exposed to client, tool call results with structured response format

UnfragileRank

Adoption15%(30% weight)

Quality16%(25% weight)

Ecosystem30%(25% weight)

Match Graph10%(15% weight)

Freshness75%(5% weight)

UnfragileRank is computed from adoption signals, documentation quality, ecosystem connectivity, match graph feedback, and freshness. No artifact can pay for a higher rank.

Type: MCP Server

7 capabilities

Visit @iflow-mcp/mailgun-mcp-server→

Package Details

npm

Registry

1.0.0

Version

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[![MCP](https://img.shields.io/badge/MCP-Server-blue.svg)](https://github.com/modelcontextprotocol)

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Capabilities7 decomposed

mcp-compliant email sending via mailgun api

Medium confidence

Solves for

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

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)

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

What makes it unique

vs alternatives

Simpler than building custom Mailgun integrations for each LLM framework because it uses the standardized MCP protocol, enabling reuse across Claude, Cline, and other MCP-compatible tools

mailgun api credential management and request signing

Medium confidence

Solves for

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)

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)

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

What makes it unique

vs alternatives

More secure than passing Mailgun credentials directly to LLM agents because credentials never enter the LLM context, reducing risk of accidental exposure in logs or model outputs

email recipient validation and batch recipient handling

Medium confidence

Solves for

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

Requires

Valid email addresses in RFC 5322 format

Mailgun API key with email validation permissions (if using real-time validation)

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

What makes it unique

Implements client-side email validation before Mailgun API calls, reducing rejected requests and API quota waste, with support for both single and batch recipient modes through a unified interface

vs alternatives

Reduces Mailgun API failures and bounce rates compared to sending unvalidated addresses directly, because validation happens before the request reaches Mailgun's servers

email template and content composition with variable substitution

Medium confidence

Solves for

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

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

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

What makes it unique

vs alternatives

attachment handling and multipart mime composition

Medium confidence

Solves for

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

Requires

File path (local filesystem) or base64-encoded binary data

MIME type (e.g., 'application/pdf', 'image/png')

Filename for the attachment

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

What makes it unique

vs alternatives

Simpler than manually constructing MIME messages because the server handles encoding and metadata, and more reliable than raw Mailgun API calls because it validates attachment format before sending

email delivery status tracking and webhook integration

Medium confidence

Solves for

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

Requires

Mailgun webhook configuration (domain settings in Mailgun dashboard)

Public URL for the MCP server webhook endpoint

Mailgun webhook signing key for signature verification

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

What makes it unique

Implements webhook-based event streaming from Mailgun, allowing agents to react to delivery events in real-time without polling, with optional event persistence and forwarding to external systems

vs alternatives

More efficient than polling Mailgun's API for delivery status because webhooks push events to the server, reducing latency and API quota usage

mcp resource and tool schema definition for email operations

Medium confidence

Solves for

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

Requires

MCP-compatible client (Claude Desktop, custom MCP host, etc.)

MCP protocol version 1.0 or later

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

What makes it unique

vs alternatives

More discoverable and type-safe than raw API documentation because MCP schema is machine-readable and enables IDE-like autocomplete in LLM clients

Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.

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@iflow-mcp/mailgun-mcp-server

Capabilities7 decomposed

mcp-compliant email sending via mailgun api

mailgun api credential management and request signing

email recipient validation and batch recipient handling

email template and content composition with variable substitution

attachment handling and multipart mime composition

email delivery status tracking and webhook integration

mcp resource and tool schema definition for email operations

Related Artifactssharing capabilities

Mailgun

@gongrzhe/server-gmail-autoauth-mcp

@cardor/email-management

agentmail-mcp

Email Send MCP

Mailtrap

Best For

Known Limitations

Requirements

Input / Output

UnfragileRank

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@iflow-mcp/mailgun-mcp-server

Capabilities7 decomposed

mcp-compliant email sending via mailgun api

mailgun api credential management and request signing

email recipient validation and batch recipient handling

email template and content composition with variable substitution

attachment handling and multipart mime composition

email delivery status tracking and webhook integration

mcp resource and tool schema definition for email operations

Related Artifactssharing capabilities

Mailgun

@gongrzhe/server-gmail-autoauth-mcp

@cardor/email-management

agentmail-mcp

Email Send MCP

Mailtrap

Best For

Known Limitations

Requirements

Input / Output

UnfragileRank

Package Details

About

Categories

Alternatives to @iflow-mcp/mailgun-mcp-server

Are you the builder of @iflow-mcp/mailgun-mcp-server?

Get the weekly brief

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