# How to integrate Smtp2go MCP with Atomic Agent ```json { "title": "How to integrate Smtp2go MCP with Atomic Agent", "toolkit": "Smtp2go", "toolkit_slug": "smtp2go", "framework": "Atomic Agent", "framework_slug": "atomic-agent", "url": "https://composio.dev/toolkits/smtp2go/framework/atomic-agent", "markdown_url": "https://composio.dev/toolkits/smtp2go/framework/atomic-agent.md", "updated_at": "2026-08-11T13:14:55.412Z" } ``` ## 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 Smtp2go. 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 Smtp2go account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions. ## Also integrate Smtp2go with - [OpenAI Agents SDK](https://composio.dev/toolkits/smtp2go/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/smtp2go/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/smtp2go/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/smtp2go/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/smtp2go/framework/codex) - [OpenClaw](https://composio.dev/toolkits/smtp2go/framework/openclaw) - [Hermes](https://composio.dev/toolkits/smtp2go/framework/hermes-agent) - [Google ADK](https://composio.dev/toolkits/smtp2go/framework/google-adk) - [LangChain](https://composio.dev/toolkits/smtp2go/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/smtp2go/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/smtp2go/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/smtp2go/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/smtp2go/framework/crew-ai) - [Pydantic AI](https://composio.dev/toolkits/smtp2go/framework/pydantic-ai) - [AutoGen](https://composio.dev/toolkits/smtp2go/framework/autogen) ## TL;DR ### How Atomic Agent connects to Smtp2go 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 Smtp2go to Atomic Agent ### Connect Smtp2go 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 Smtp2go. It searches Composio for the right tool. - On first use, open the sign-in link returned in the chat. Connect your Smtp2go 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 Smtp2go MCP server, and what's possible with it? The Smtp2go MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Smtp2go account. It provides structured and secure access to your email sending and management infrastructure, so your agent can perform actions like searching email activity, managing allowed senders, updating sender domains, and controlling IP allow lists on your behalf. - Comprehensive email activity search: Ask your agent to filter and retrieve email events such as sends, opens, clicks, and bounces by recipient, date, or message ID. - Allowed sender management: Have your agent add, update, remove, or view allowed sender email addresses to control who can send emails from your account. - Sender domain configuration: Let the agent register new sender domains for SPF/DKIM verification and manage domain-related settings seamlessly. - IP allow list control: Direct your agent to add or remove IP addresses or CIDR ranges in your account’s IP allow list, enhancing security for sending sources. - Email delivery monitoring: Enable your agent to search and analyze sent emails, helping you monitor delivery, troubleshoot issues, and ensure reliable communication. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `SMTP2GO_ACTIVITY_SEARCH` | Search Email Activity | Tool to search activity events like sends, opens, clicks, and bounces. Use when you need to filter account email activity by date, event, recipient, or message ID. | | `SMTP2GO_ALLOWED_SENDERS_ADD` | Add Allowed Sender | Tool to add a new allowed sender email address. Use when you need to whitelist a sender before sending email. Example: Add "user@example.com" to allowed senders list. | | `SMTP2GO_ALLOWED_SENDERS_REMOVE` | Remove Allowed Sender | Tool to remove a sender email address from the allowed senders list. Use when you need to revoke send permissions for a validated address. | | `SMTP2GO_ALLOWED_SENDERS_UPDATE` | Update Allowed Senders | Tool to update (replace) the entire allowed senders list in your SMTP2GO account. This action overwrites the current list with the provided email addresses and domain names. Use when you need to set or update who can send emails through your account. Example: 'Update allowed senders to include user@example.com and admin@company.com in whitelist mode.' | | `SMTP2GO_ALLOWED_SENDERS_VIEW` | View Allowed Senders | Tool to view the list of allowed senders configured in your account. Use after setting up SMTP2GO authentication to retrieve your allowed-senders list. Example: 'Show me all verified allowed senders.' | | `SMTP2GO_DOMAIN_ADD` | Add Sender Domain | Tool to add a new sender domain for SPF/DKIM verification. Use when you need to register a domain and optionally set tracking/return-path subdomains. | | `SMTP2GO_EMAIL_SEARCH` | Search SMTP2GO Emails | Tool to search sent emails. Use when filtering your SMTP2GO account's email activity by criteria like date, sender, or recipient. Call after authentication. | | `SMTP2GO_IP_ALLOW_LIST_ADD` | Add IP Allow List | Tool to add a public IP address to your account's IP allow list. Use when you need to whitelist specific sending sources by IP after confirming accuracy. Note: Only plain IP addresses are supported (no CIDR notation). Private/reserved IP ranges are rejected. | | `SMTP2GO_IP_ALLOW_LIST_REMOVE` | Remove IP from Allow List | Tool to remove an IP address from your account's IP allow list. Use after identifying the IP you wish to revoke. | | `SMTP2GO_IP_ALLOW_LIST_VIEW` | View IP Allow List | Tool to view the list of IP addresses in your IP allow list. Use after confirming your SMTP2GO API key is set. | | `SMTP2GO_SMS_VIEW_RECEIVED` | View Received SMS | Tool to retrieve received SMS replies for your SMTP2GO account. Use when you need to fetch incoming SMS messages for analysis or display. Pagination supported via limit and offset. | | `SMTP2GO_STATS_EMAIL_BOUNCES` | Get Email Bounces Stats | Tool to retrieve email bounces statistics. Use after sending emails to analyze bounce metrics over a time period. | | `SMTP2GO_STATS_EMAIL_CYCLE` | Email Cycle Statistics | Tool to retrieve current email cycle/quota statistics. Use when you need to check the account's monthly email allowance, usage, and remaining quota for the current billing cycle. | | `SMTP2GO_STATS_EMAIL_HISTORY` | Email History Statistics | Tool to retrieve email history statistics. Use when you need detailed delivery metrics within a date range. | | `SMTP2GO_STATS_EMAIL_SPAM` | Email Spam Statistics | Tool to retrieve email spam report statistics. Use when analyzing spam trends for sent emails. | | `SMTP2GO_STATS_EMAIL_UNSUBS` | Email Unsubscription Stats | Tool to retrieve email unsubscribe statistics. Use when you need unsubscribe data for your account over a date range. | | `SMTP2GO_SUBACCOUNTS_SEARCH` | Search Subaccounts | Tool to search subaccounts. Use after authenticating to filter and paginate your subaccounts by name, email, or status. | | `SMTP2GO_SUBACCOUNTS_USAGE` | Subaccounts Usage | Tool to retrieve usage statistics for subaccounts. Use when you need to monitor per-subaccount email usage. | | `SMTP2GO_SUPPRESSION_ADD` | Add to Suppression List | Tool to add email addresses or domains to the suppression list. Use when you need to block sending emails to specific recipients or entire domains after unsubscribes or bounces. | | `SMTP2GO_SUPPRESSION_REMOVE` | Remove suppression entry | Tool to remove an email address or domain from the suppression list. Use when you want to resume sending to the address or domain. | | `SMTP2GO_SUPPRESSION_VIEW` | View Suppression List | Tool to view the suppression list. Use when you need to inspect suppressed email addresses in your account. | | `SMTP2GO_TEMPLATE_EDIT` | Edit Email Template | Tool to edit details of an existing email template. Use when you need to update template properties after confirming its ID. | | `SMTP2GO_TEMPLATE_SEARCH` | Search Email Templates | Tool to search your collection of email templates by ID or name. Use when you need to find templates matching specific criteria after authentication. | | `SMTP2GO_TEMPLATE_VIEW` | View Email Template | Tool to view details of a specific email template. Use after you have the template ID to inspect. | | `SMTP2GO_USERS_SMTP_ADD` | Add SMTP User | Tool to add a new SMTP user. Use when you need to provision a fresh SMTP credential after collecting username and password. | | `SMTP2GO_USERS_SMTP_EDIT` | Edit SMTP User | Tool to edit details of an existing SMTP user. Use when you need to update username, password, sender restrictions, or enable/disable a user after confirming the target username. | | `SMTP2GO_USERS_SMTP_REMOVE` | Remove SMTP User | Tool to remove an SMTP user from your account. Use when you need to revoke SMTP access for a user. | | `SMTP2GO_USERS_SMTP_VIEW` | View SMTP Users | Tool to list all SMTP users configured on your account. Use when you need to retrieve SMTP user configurations. | | `SMTP2GO_WEBHOOK_ADD` | Add Webhook | Tool to create a new webhook. Use when you need real-time notifications of email or SMS events. | | `SMTP2GO_WEBHOOK_EDIT` | Edit Webhook | Tool to edit an existing webhook’s settings. Use when you need to update a webhook's configuration after creation. | | `SMTP2GO_WEBHOOK_REMOVE` | Remove webhook | Tool to remove a webhook. Use when you want to delete a webhook by its ID from your SMTP2GO account. | | `SMTP2GO_WEBHOOK_VIEW` | View Webhooks | Tool to view all webhooks configured in your account. Use when you need to inspect existing webhook configurations after setup. | ## 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 Smtp2go from Atomic Agent With your account connected, ask Atomic Agent to work with Smtp2go 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 Smtp2go MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/smtp2go/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/smtp2go/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/smtp2go/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/smtp2go/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/smtp2go/framework/codex) - [OpenClaw](https://composio.dev/toolkits/smtp2go/framework/openclaw) - [Hermes](https://composio.dev/toolkits/smtp2go/framework/hermes-agent) - [Google ADK](https://composio.dev/toolkits/smtp2go/framework/google-adk) - [LangChain](https://composio.dev/toolkits/smtp2go/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/smtp2go/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/smtp2go/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/smtp2go/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/smtp2go/framework/crew-ai) - [Pydantic AI](https://composio.dev/toolkits/smtp2go/framework/pydantic-ai) - [AutoGen](https://composio.dev/toolkits/smtp2go/framework/autogen) ## Related Toolkits - [0CodeKit](https://composio.dev/toolkits/0codekit) - 0CodeKit is a utility API platform for AI, document, image, and data workflows. Use it to convert, validate, generate, store, and automate data without custom backend code. - [Airtop](https://composio.dev/toolkits/airtop) - Airtop is a cloud browser platform for AI-powered web automation. Use it to navigate sites, extract data, and run reusable browser workflows. - [Apify MCP](https://composio.dev/toolkits/apify_mcp) - Apify MCP is the official MCP server for Apify's web scraping and browser automation platform. Use it to run actors, collect structured web data, and automate crawling workflows. - [Apilio](https://composio.dev/toolkits/apilio) - Apilio is a home automation platform that lets you connect and control smart devices from different brands. It helps you build flexible automations with complex conditions, schedules, and integrations. - [Basin](https://composio.dev/toolkits/basin) - Basin is a no-code form backend for quickly setting up reliable contact forms. 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It helps businesses automate notifications and keep customers updated every step of the way. - [Dify](https://composio.dev/toolkits/dify) - Dify is a platform for running and managing published workflow apps via a Service API. Use it to execute workflows and inspect configuration and run history quickly. - [Digital Humani](https://composio.dev/toolkits/digital_humani) - Digital Humani is a reforestation API for browsing planting projects, submitting tree requests, and tracking planted trees. It helps teams connect climate action directly to products, campaigns, and customer experiences. - [Dnsfilter](https://composio.dev/toolkits/dnsfilter) - Dnsfilter is a cloud-based DNS security and content filtering solution. It helps organizations block online threats and manage safe internet access with ease. - [EnforcedFlow](https://composio.dev/toolkits/enforcedflow) - EnforcedFlow is a work routing platform for advanced round-robin groups, agent criteria, availability, and email assignments. It helps teams distribute work fairly and quickly using configurable assignment rules. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Smtp2go MCP? With a standalone Smtp2go MCP server, the agents and LLMs can only access a fixed set of Smtp2go tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Smtp2go 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 Smtp2go tools. ### Can I manage the permissions and scopes for Smtp2go while using Tool Router? Yes, absolutely. You can configure which Smtp2go 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 Smtp2go data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)