# How to integrate Enginemailer MCP with Atomic Agent ```json { "title": "How to integrate Enginemailer MCP with Atomic Agent", "toolkit": "Enginemailer", "toolkit_slug": "enginemailer", "framework": "Atomic Agent", "framework_slug": "atomic-agent", "url": "https://composio.dev/toolkits/enginemailer/framework/atomic-agent", "markdown_url": "https://composio.dev/toolkits/enginemailer/framework/atomic-agent.md", "updated_at": "2026-08-11T13:09:09.514Z" } ``` ## Introduction Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Enginemailer. This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Enginemailer account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions. ## Also integrate Enginemailer with - [OpenAI Agents SDK](https://composio.dev/toolkits/enginemailer/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/enginemailer/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/enginemailer/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/enginemailer/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/enginemailer/framework/codex) - [OpenClaw](https://composio.dev/toolkits/enginemailer/framework/openclaw) - [Hermes](https://composio.dev/toolkits/enginemailer/framework/hermes-agent) - [Google ADK](https://composio.dev/toolkits/enginemailer/framework/google-adk) - [LangChain](https://composio.dev/toolkits/enginemailer/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/enginemailer/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/enginemailer/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/enginemailer/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/enginemailer/framework/crew-ai) - [Pydantic AI](https://composio.dev/toolkits/enginemailer/framework/pydantic-ai) - [AutoGen](https://composio.dev/toolkits/enginemailer/framework/autogen) ## TL;DR ### How Atomic Agent connects to Enginemailer Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication. Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account. ## Connect Enginemailer to Atomic Agent ### Connect Enginemailer to Atomic Agent - Sign up or sign in to the [Composio dashboard](https://dashboard.composio.dev/?cta_placement=atomic-agent-api-key). Copy your API key. - In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart. - Ask Atomic Agent to do something in Enginemailer. It searches Composio for the right tool. - On first use, open the sign-in link returned in the chat. Connect your Enginemailer account, then return to Atomic Agent to continue. ### Headless setup Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file. ```bash COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY ``` ## What is the Enginemailer MCP server, and what's possible with it? The Enginemailer MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Enginemailer account. It provides structured and secure access to your email marketing platform, so your agent can perform actions like creating campaigns, managing subscriber lists, exporting reports, and sending personalized email campaigns on your behalf. - Campaign creation and scheduling: Direct your agent to set up new email campaigns, configure content, and schedule delivery to your audience. - Subscriber management: Have your agent add new subscribers to your lists, including custom fields and segmentation for targeted outreach. - Instant campaign delivery and controls: Command your agent to send campaigns immediately or pause scheduled campaigns for last-minute adjustments. - Campaign monitoring and reporting: Let your agent export detailed email campaign reports as CSV files and check the status of ongoing exports. - Audience segmentation and subcategory retrieval: Guide your agent to fetch subcategories and organize recipients for more personalized and effective campaigns. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `ENGINEMAILER_ACTIVATE_SUBSCRIBER` | Activate Subscriber | Tool to activate an inactive subscriber in EngineMailer. Use when you need to reactivate a subscriber that was previously deactivated either through the API or manually. | | `ENGINEMAILER_ADD_UPDATE_SUBSCRIBER` | Add or Update Subscriber | Tool to add or update a subscriber with custom fields via N8N integration. Use when you need to create a new subscriber or update an existing one in the EngineMailer system. | | `ENGINEMAILER_BATCH_UPDATE_STATUS` | Check Batch Update Status | Tool to check the status of a batch subscriber update operation. Use when you need to verify if a batch update job has completed or is still processing. | | `ENGINEMAILER_BATCH_UPDATE_SUBSCRIBERS` | Batch Update Subscribers | Tool to add or update multiple subscribers with custom fields in a single batch operation. Use when you need to create or update multiple subscribers efficiently. Subscribers that fail validation are removed from processing automatically. | | `ENGINEMAILER_CHECK_EXPORT_STATUS_V2` | Check Export Status V2 | Tool to check status of a previously requested CSV report export. Use after initiating an export to poll for completion. Large exports may take significant time; poll repeatedly until status indicates readiness before consuming the export data. | | `ENGINEMAILER_CONNECT` | Test API Connection | Tool to test API connection and verify authentication. Use when you need to validate API credentials or check connectivity. | | `ENGINEMAILER_CREATE_CAMPAIGN` | Create Campaign | Tool to create a new email campaign. Use when you need to configure and schedule a campaign before sending. Set trackOpens and trackClicks at creation; these flags cannot retroactively affect already-delivered messages. | | `ENGINEMAILER_DELETE_CAMPAIGN` | Delete Campaign | Tool to delete an undelivered email campaign. Use when you need to remove a campaign that has not been sent yet. | | `ENGINEMAILER_DELETE_RECIPIENT_LIST` | Delete Recipient List | Tool to delete an existing recipient list from a targeted campaign. Use when you need to remove a specific recipient list from a campaign. | | `ENGINEMAILER_DELETE_SUBSCRIBER` | Delete Subscriber | Tool to remove a subscriber from the system by email address. Use when you need to permanently delete a subscriber's record. | | `ENGINEMAILER_EXPORT_CSV_REPORT_V2` | Export CSV Report V2 | Tool to export a transactional email report as CSV. Initiates an async export within a specific date range (max past 60 days); check readiness via ENGINEMAILER_CHECK_EXPORT_STATUS_V2 before using the export. | | `ENGINEMAILER_FIND_SUBSCRIBER` | Find Subscriber | Tool to find a subscriber by email address via N8N integration. Use when you need to search for and retrieve subscriber information from the EngineMailer system. | | `ENGINEMAILER_GET_GETCUSTOMFIELD` | Get Custom Field List | Tool to retrieve the list of custom fields configured for subscribers. Use when you need to discover available custom fields for subscriber management. | | `ENGINEMAILER_GET_LISTCAMPAIGN` | Get List Campaign | Tool to get a list of undelivered campaigns. Use when you need to fetch campaigns awaiting delivery. | | `ENGINEMAILER_GET_NEW_SUBSCRIBERS` | Get New Subscribers | Tool to retrieve new subscribers with optional filtering by source, form, page, or popup. Use when you need to fetch recently added subscribers for synchronization or reporting workflows. | | `ENGINEMAILER_GET_SUBCATEGORY` | Get Subcategories | Tool to retrieve subcategories for a given category. Use when you need to list or choose subcategories after selecting a category. | | `ENGINEMAILER_GET_SUBSCRIBER` | Get Subscriber | Tool to retrieve subscriber information by email address. Use when you need to fetch details about a specific subscriber including their custom fields. | | `ENGINEMAILER_GET_SUBSCRIBER_AUTORESPONDER_COMPLETED` | Get Subscriber Autoresponder Completed | Tool to retrieve subscribers who completed autoresponders with optional filtering by autoresponder ID. Use when you need to fetch completion events for autoresponders, optionally filtered by specific autoresponder or polling for new events since a timestamp. | | `ENGINEMAILER_GET_SUBSCRIBER_AUTORESPONDER_TRIGGERED` | Get Subscriber Autoresponder Triggered | Tool to retrieve subscribers who triggered autoresponders with optional filtering by autoresponder ID. Use when you need to fetch trigger events for autoresponders, optionally filtered by specific autoresponder or polling for new events since a timestamp. | | `ENGINEMAILER_GET_SUBSCRIBERS_DELETED` | Get Deleted Subscribers | Tool to retrieve deleted subscribers since last polling date. Use when you need to track or sync subscribers who have been removed from the system. | | `ENGINEMAILER_GET_SUBSCRIBERS_MODIFIED` | Get Subscribers Modified | Tool to retrieve modified subscribers since last polling date with optional limit. Use when you need to fetch recently modified subscribers for synchronization or polling workflows. | | `ENGINEMAILER_GET_SUBSCRIBERS_TAGGED` | Get Subscribers Tagged | Tool to retrieve subscribers who were tagged with optional filtering by subcategory. Use when you need to fetch tagged subscribers for synchronization or reporting workflows. | | `ENGINEMAILER_GET_SUBSCRIBERS_UNTAGGED` | Get Untagged Subscribers | Tool to retrieve subscribers who were untagged from subcategories. Use when you need to track or sync subscribers who have had tags removed, with optional filtering by subcategory and polling date. | | `ENGINEMAILER_GET_UNSUBSCRIBE` | Get Unsubscribe Events | Tool to retrieve unsubscribe events with optional filtering by campaign or autoresponder. Use when you need to fetch unsubscribe data for reporting, synchronization, or compliance workflows. | | `ENGINEMAILER_INSERT_SUBSCRIBER` | Insert Subscriber | Tool to add a new subscriber with optional custom fields. Use when registering a user to a specific mailing list after verifying their email. | | `ENGINEMAILER_LIST_AUTORESPONDERS` | List Autoresponders | Tool to retrieve a list of all autoresponders. Use when you need to fetch available autoresponders configured in the system. | | `ENGINEMAILER_LIST_CAMPAIGNS` | List Campaigns | Tool to retrieve a list of all campaigns. Use when you need to fetch all campaigns from the system. | | `ENGINEMAILER_LIST_FORMS` | List Forms | Tool to retrieve a list of available forms in Enginemailer. Use when you need to discover forms for n8n integration or workflow configuration. | | `ENGINEMAILER_LIST_PAGES` | List Pages | Tool to retrieve a list of all pages. Use when you need to fetch available pages. | | `ENGINEMAILER_LIST_POPUPS` | List Popups | Tool to retrieve a list of popups from Enginemailer. Use when you need to fetch available popups for n8n workflows. | | `ENGINEMAILER_LIST_TEMPLATES` | List Templates | Tool to retrieve a list of all email templates. Use when you need to fetch available email templates for campaigns. | | `ENGINEMAILER_PAUSE_CAMPAIGN` | Pause Campaign | Tool to pause a scheduled email campaign. Use when you need to halt a campaign before sending to apply updates or adjust schedule. | | `ENGINEMAILER_POST_UPDATECATEGORY` | Create/Update Category | Tool to create or update a category for subscriber segmentation. Use when organizing subscribers by common interests for targeted email marketing. | | `ENGINEMAILER_POST_UPDATE_SUBSCRIBER` | Update Subscriber | Tool to update data for an existing subscriber in EngineMailer. Use when you need to modify subscriber information such as custom fields or subcategory assignments. | | `ENGINEMAILER_SEND_CAMPAIGN` | Send Campaign | Tool to send an email campaign immediately. Use when the campaign exists, has at least one recipient, and is not scheduled or already delivered. E.g., 'Send campaign 123 now'. | | `ENGINEMAILER_TAG_TO_SUBCATEGORY` | Tag Subscriber to Subcategory | Tool to tag a subscriber to a specific subcategory via N8N API endpoint. Use when you need to categorize or organize subscribers by assigning them to a subcategory. | | `ENGINEMAILER_UNSUBSCRIBE` | Unsubscribe (N8N) | Tool to unsubscribe a subscriber via N8N API endpoint. Use when you need to remove a subscriber from the mailing list using the N8N integration endpoint. | | `ENGINEMAILER_UNSUBSCRIBE_SUBSCRIBER` | Unsubscribe Subscriber | Tool to unsubscribe a subscriber from the email list. Use when a user requests to be removed from the mailing list or to comply with unsubscribe requests. | ## Supported Triggers None listed. ## Troubleshooting ### Why is my API key rejected? Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying. ### Why are Composio tools unavailable after saving a key? Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk. ### Does Composio have a free plan? The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See [Composio pricing](/pricing) for the current limits that apply to your connection. ## Complete Code None listed. ## Conclusion ### Use Enginemailer from Atomic Agent With your account connected, ask Atomic Agent to work with Enginemailer in natural language. You can connect more apps through the same Composio integration as you need them. Visit the [Atomic Agent website](https://atomicagent.io/?cta_placement=atomic-agent-site) or inspect the [Atomic Agent source code](https://github.com/AtomicBot-ai/atomic-agent?cta_placement=atomic-agent-repo). ## How to build Enginemailer MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/enginemailer/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/enginemailer/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/enginemailer/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/enginemailer/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/enginemailer/framework/codex) - [OpenClaw](https://composio.dev/toolkits/enginemailer/framework/openclaw) - [Hermes](https://composio.dev/toolkits/enginemailer/framework/hermes-agent) - [Google ADK](https://composio.dev/toolkits/enginemailer/framework/google-adk) - [LangChain](https://composio.dev/toolkits/enginemailer/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/enginemailer/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/enginemailer/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/enginemailer/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/enginemailer/framework/crew-ai) - [Pydantic AI](https://composio.dev/toolkits/enginemailer/framework/pydantic-ai) - [AutoGen](https://composio.dev/toolkits/enginemailer/framework/autogen) ## Related Toolkits - [Reddit](https://composio.dev/toolkits/reddit) - Reddit is a social news platform with thriving user-driven communities (subreddits). It's the go-to place for discussion, content sharing, and viral marketing. - [Facebook](https://composio.dev/toolkits/facebook) - Facebook is a social media and advertising platform for businesses and creators. It helps you connect, share, and manage content across your public Facebook Pages. - [Linkedin](https://composio.dev/toolkits/linkedin) - LinkedIn is a professional networking platform for connecting, sharing content, and engaging with business opportunities. It's the go-to place for building your professional brand and unlocking new career connections. - [Active campaign](https://composio.dev/toolkits/active_campaign) - ActiveCampaign is a marketing automation and CRM platform for managing email campaigns, sales pipelines, and customer segmentation. It helps businesses engage customers and drive growth through smart automation and targeted outreach. - [ActiveTrail](https://composio.dev/toolkits/active_trail) - ActiveTrail is a user-friendly email marketing and automation platform. It helps you reach subscribers and automate campaigns with ease. - [Adobe Marketing Agent MCP](https://composio.dev/toolkits/adobe_marketing_agent_mcp) - Adobe Marketing Agent MCP is Adobe's hosted MCP service that exposes marketing context, preferences, and agent capabilities. Use it to provide agents with campaign, audience, and analytics context via a managed integration. - [Ahrefs](https://composio.dev/toolkits/ahrefs) - Ahrefs is an SEO and marketing platform for site audits, keyword research, and competitor insights. 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It helps grow audience engagement and monetize your mailing list. - [Benchmark email](https://composio.dev/toolkits/benchmark_email) - Benchmark Email is a platform for creating, sending, and tracking email campaigns. It's built to help you engage audiences and analyze results—all in one place. - [Bigmailer](https://composio.dev/toolkits/bigmailer) - BigMailer is an email marketing platform for managing multiple brands with white-labeling and automation. It helps teams streamline campaigns and simplify integration with Amazon SES. - [Bitly](https://composio.dev/toolkits/bitly) - Bitly is a link management platform for shortening, customizing, sharing, and tracking links and QR codes. It helps teams create branded links and measure engagement across campaigns. - [BlueFox Email](https://composio.dev/toolkits/bluefox_email) - BlueFox Email is an email API for managing contacts, subscriber lists, and sending transactional and triggered messages. Use it to reliably send transactional and triggered emails and manage subscribers at scale. - [Brandfetch](https://composio.dev/toolkits/brandfetch) - Brandfetch is an API that delivers company logos, colors, and visual branding assets. It helps marketers and developers keep brand visuals consistent everywhere. - [Braze](https://composio.dev/toolkits/braze) - Braze is a customer engagement platform for managing user data, messaging, campaigns, and analytics. Use it to deliver targeted, multi-channel messaging and analyze campaign performance. - [Brevo](https://composio.dev/toolkits/brevo) - Brevo is an all-in-one email and SMS marketing platform for transactional messaging, automation, and CRM. It helps businesses engage customers and streamline communications through powerful campaign tools. - [Buffer](https://composio.dev/toolkits/buffer) - Buffer is a social media management platform for planning, creating, scheduling, and publishing posts across connected channels. It helps teams keep content organized and publish consistently without jumping between social apps. - [BulkPublish](https://composio.dev/toolkits/bulkpublish) - BulkPublish is a social media publishing platform for managing scheduled content across multiple channels. It helps teams plan campaigns, publish consistently, and track performance in one place. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Enginemailer MCP? With a standalone Enginemailer MCP server, the agents and LLMs can only access a fixed set of Enginemailer tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Enginemailer and many other apps based on the task at hand, all through a single MCP endpoint. ### Can I use Tool Router MCP with Atomic Agent? Yes, you can. Atomic Agent fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Enginemailer tools. ### Can I manage the permissions and scopes for Enginemailer while using Tool Router? Yes, absolutely. You can configure which Enginemailer scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do. ### How safe is my data with Composio Tool Router? All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Enginemailer data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)