# The best email marketing MCP servers > Official MCP servers for newsletters, ecommerce flows and cold email, compared on hosting, sign-in, sending and price. Manifold MCP pairs as the lead research server. By Jesse Sibley, Founder of Manifold. Published 4 Nov 2026, updated 4 Nov 2026. Filed under [Leads](https://www.manifoldmcp.com/blog/topics/leads.md). ## Key takeaways - Official hosted servers exist for Klaviyo, MailerLite, Kit, Brevo, Instantly, Smartlead and lemlist. Mailchimp is three products: a Claude and ChatGPT app that drafts campaigns, a Transactional MCP that sends Mandrill mail, and a docs MCP that searches developer docs. - Klaviyo, MailerLite, Kit and lemlist sign in with OAuth on a hosted URL. Instantly, Smartlead, Brevo's full MCP server and Mailchimp Transactional take an API key. Klaviyo also ships a local server with PRIVATE_API_KEY, READ_ONLY and ALLOW_USER_GENERATED_CONTENT. - Sending is not the same on every server. Kit and Mailchimp's app save drafts. MailerLite sends through MCP on paid plans. Brevo's Claude connector drafts; its MCP server can send. Instantly and lemlist can start campaigns, and lemlist asks you to approve sends. - Custom MCP servers in ChatGPT are added at chatgpt.com/plugins (Add, then Create custom MCP server) on Plus, Pro, Business, Enterprise and Edu, on the web. Klaviyo, Mailchimp, MailerLite and lemlist also list a ChatGPT app or plugin. - Manifold MCP is hosted, with no API keys of your own, and is pay per call. It does not connect to your email platform. Pair it with one of the servers above so your agent can find companies, people and verified work emails first. An email marketing MCP server connects Claude, ChatGPT, Cursor or another agent to a newsletter, ecommerce or cold email platform: subscribers, campaigns, sequences, reporting, and, on some servers, sending. That is a different job from [finding prospects and verified work emails](https://www.manifoldmcp.com/blog/best-lead-generation-mcp-servers). The wider set of marketing servers sits in [the best MCP servers for marketing](https://www.manifoldmcp.com/blog/best-mcp-servers-for-marketing). Prices below were checked in November 2026. ## Email marketing MCP servers compared | Server | Best for | Hosted or local | How you connect | Can it send or launch | Works in | Price (checked November 2026) | | --- | --- | --- | --- | --- | --- | --- | | **Klaviyo** | Ecommerce flows and campaign reporting | Hosted, or local (`uvx`) | OAuth on `https://mcp.klaviyo.com/mcp`; local uses `PRIVATE_API_KEY`, `READ_ONLY` and `ALLOW_USER_GENERATED_CONTENT` | Creates campaigns; `read-only=true` on a custom connector turns writes off | Claude (listed connector), ChatGPT (app), Cursor, VS Code | Klaviyo plan; no separate MCP price published | | **Mailchimp app** | Drafts you launch in Mailchimp | Hosted as a Claude and ChatGPT app | Sign in through Claude or ChatGPT | Drafts campaigns; you launch in Mailchimp | Claude and ChatGPT in the US, Canada, UK and Australia | Standard and Premium | | **Mailchimp Transactional** | Transactional (Mandrill) sends | Hosted | Transactional API key as a Bearer header | Sends transactional mail, not marketing campaigns | Claude Desktop, Claude Code, Cursor, VS Code | Mailchimp Transactional plan; no separate MCP price published | | **MailerLite** | Newsletters on a small paid plan | Hosted | OAuth at `https://mcp.mailerlite.com/mcp`; no API key | Sends on paid plans; Free MCP has no sending | Claude, Claude Code, Cursor, VS Code, Gemini CLI, ChatGPT plugin | Free MCP limited, no sending; Comfort from $12/mo, Power from $25/mo | | **Kit** | Creator broadcasts saved as drafts | Hosted | OAuth at `https://app.kit.com/mcp` | Drafts only; you schedule or send in Kit | Claude, ChatGPT, Cursor | Paid Creator and Creator Pro | | **Brevo** | Email, SMS and CRM in one account | Hosted | Claude connector with OAuth, or an MCP API key as a Bearer header | Claude connector drafts; the MCP server can send | Claude connector; MCP server in Claude Desktop, Claude Code, Cursor, VS Code, Windsurf | Brevo account; no separate MCP price published | | **Instantly** | Cold email campaigns you already run | Hosted | API key in the `Authorization` header, or in the URL path | Creates and manages campaigns | Claude, Cursor, n8n (ChatGPT not documented) | Free with an Instantly subscription; API access required | | **Smartlead** | Cold email stats in Claude Desktop | Hosted SSE, or local (`npx`) | API key in the SSE URL, or `SMARTLEAD_API_KEY` locally | Campaign and account data; sending not documented on the help center | Claude Desktop | Free with any paid Smartlead plan | | **lemlist** | Multichannel outbound with OAuth | Hosted | OAuth (recommended) or `X-API-Key` at `https://app.lemlist.com/mcp` | Starts campaigns; you approve sends | Claude, Claude Code, Cursor, ChatGPT plugin, Grok | lemlist account; no separate MCP price published | | **Zapier** | Mailchimp actions inside a Zapier plan | Hosted | Zapier account, then Mailchimp | Create Campaign drafts; Send Campaign sends | Claude, ChatGPT, Cursor | Included in every Zapier plan; two tasks per call | | **Manifold MCP** | Lead research paired with an email server | Hosted | Manifold sign-in, no API keys of your own | Does not connect to your email platform | Claude, ChatGPT, Cursor | [250 free credits a month](https://www.manifoldmcp.com/pricing), Pro from $20/mo | ![Chart of email marketing MCP servers by hosted, OAuth, sending and whether they use your email account](https://www.manifoldmcp.com/blog/best-email-marketing-mcp-servers/best-email-marketing-mcp-servers-hosted-oauth-or-sends.svg#1248x1034 "Hosted or local, OAuth versus an API key, and whether the server can send or launch campaigns, from each vendor's own page in November 2026.") ## Newsletter and ecommerce platforms ### Klaviyo [Klaviyo's MCP server](https://developers.klaviyo.com/en/docs/connect_to_the_klaviyo_mcp_server) is official. Klaviyo recommends the remote server at `https://mcp.klaviyo.com/mcp` over Streamable HTTP, with OAuth and dynamic client registration. You need an Owner, Admin or Manager role. Claude has a listed connector. ChatGPT has a Klaviyo app. Cursor and VS Code add the same URL. Query parameters (`read-only=true`, `toolsets`, `core-tools-only`) work only on a custom connector. Agencies add one custom connector per account and pass `?company=`. Your agent pulls last month's flow revenue, compares campaigns, or creates an email campaign when the write tools are on. The [product page](https://www.klaviyo.com/solutions/ai/klaviyo-mcp-server) lists campaigns, flows, profiles, reporting, catalogs and events. A separate local server runs with `uvx klaviyo-mcp-server@latest`. The env vars it needs are `PRIVATE_API_KEY`, `READ_ONLY` and `ALLOW_USER_GENERATED_CONTENT`: ```json { "mcpServers": { "klaviyo": { "command": "uvx", "args": ["klaviyo-mcp-server@latest"], "env": { "PRIVATE_API_KEY": "YOUR_API_KEY", "READ_ONLY": "false", "ALLOW_USER_GENERATED_CONTENT": "false" } } } } ``` **Best for:** Ecommerce flows and campaign reporting in Claude or ChatGPT, with writes you can turn off on a custom connector. ### Mailchimp "Mailchimp MCP" is three separate things. The [Mailchimp app in Claude and ChatGPT](https://mailchimp.com/newsroom/introducinganalyticsai/) plans and drafts campaigns from your Mailchimp data and saves them so you launch in Mailchimp. Mailchimp says the app is available in the US, Canada, UK and Australia. [Connectors](https://mailchimp.com/solutions/ai-tools/) sit on Standard and Premium plans (check your plan if those pages disagree). [Mailchimp Transactional (Mandrill) MCP](https://mailchimp.com/developer/transactional/guides/how-to-use-mailchimps-transactional-messaging-mcp) is a different server at `https://mandrillapp.com/mcp`. You send a Transactional API key as a `Authorization: Bearer` header. It mirrors the Transactional API: account status, templates, API calls, failed-send diagnosis. It can send transactional mail. It does not send marketing campaigns. A [docs MCP](https://mailchimp.com/developer/marketing/build/ai-tools/mcp-server/) at `https://mailchimp.com/developer/_mcp/server` searches Mailchimp's developer docs. It does not touch your account and needs no Mailchimp credential. **Best for:** Drafting Mailchimp campaigns in Claude or ChatGPT, or sending transactional mail through Mandrill. Not one official marketing MCP that launches newsletters from the agent. ### MailerLite [MailerLite's official MCP](https://developers.mailerlite.com/mcp) is hosted at `https://mcp.mailerlite.com/mcp`. You sign in with OAuth. There is no API key. The [help center](https://www.mailerlite.com/help/how-to-connect-mailerlites-mcp) installs it as a ChatGPT plugin, and also documents Claude, VS Code and Cursor. Claude Code: ```text claude mcp add --transport http mailerlite https://mcp.mailerlite.com/mcp ``` Your agent manages subscribers, groups, campaigns and automations. [Pricing](https://www.mailerlite.com/pricing) puts MCP on Free with limits and no sending. Sending through the API and MCP is on paid plans. Comfort starts at $12/month. Power starts at $25/month. **Best for:** Newsletters for a small business that wants OAuth and sending on a paid plan. ### Kit [Kit MCP](https://developers.kit.com/mcp/kit-mcp) is hosted at `https://app.kit.com/mcp`. You sign in with OAuth. It is on paid Creator and Creator Pro plans. [Kit's help center](https://help.kit.com/en/articles/14827557-how-to-connect-the-kit-mcp-to-your-ai-tools) documents Claude, ChatGPT and Cursor. Free creators can connect and see the tools; running one asks them to upgrade. Your agent reads subscribers, tags, sequences and broadcasts, and can draft a broadcast. Kit's developer docs say the MCP does not schedule or send. Each draft comes back with a `confirm_url` so you finish it in Kit. **Best for:** Creators who want the agent to draft broadcasts and leave sending in Kit. ### Brevo Brevo has two official paths. The [Claude connector](https://www.brevo.com/integrations/claude/) is listed in Claude. You sign in with OAuth. No API key. Claude drafts email and SMS campaigns that you review and send in Brevo. Brevo says the connector never sends, schedules or deletes. The [Brevo MCP server](https://developers.brevo.com/docs/mcp-protocol.mdx) is hosted at `https://mcp.brevo.com/v1/brevo/mcp`. You create an MCP API key under SMTP and API, then API Keys, with "Create MCP server API key", and send it as a Bearer header. [Brevo's help center](https://help.brevo.com/hc/en-us/articles/27978590646802-What-is-Model-Context-Protocol-MCP) documents Claude Desktop, Claude Code, Cursor, Windsurf, VS Code and Cline. The product page says this server can send campaigns. You can point at a smaller module URL if you only want contacts or campaign analytics. **Best for:** Teams already on Brevo. Use the Claude connector for drafts. Use the MCP server when you want the full account, sending included. ## Cold email and outbound platforms ### Instantly [Instantly MCP](https://www.manifoldmcp.com/blog/instantly-mcp) is Instantly's official hosted server at `https://mcp.instantly.ai/mcp`. Instantly documents Streamable HTTP. You send an API key in the `Authorization` header, or in the URL path if the client cannot set headers. The [help center](https://help.instantly.ai/en/articles/12980002-instantly-mcp-model-context-protocol) covers Claude, Cursor and n8n. Instantly does not document ChatGPT. Your agent works on campaigns, leads, analytics, inbox replies and sending accounts. Instantly says the MCP server is free with your subscription, and that you need an account with API access. **Best for:** Cold email at volume when the campaigns already live in Instantly. ### Smartlead Smartlead documents two setups. The [help center](https://helpcenter.smartlead.ai/en/articles/300-smartlead-mcp-server) is the current one: SSE only, Claude Desktop, through `npx -y mcp-remote` (Node.js required). The key sits in the URL: ```text npx -y mcp-remote https://mcp.smartlead.ai/sse?user_api_key=YOUR_API_KEY ``` Smartlead's [setup blog](https://www.smartlead.ai/blog/smartlead-mcp-setup-guide) shows a local `npx -y @smartlead/mcp-server` with `SMARTLEAD_API_KEY` in the env. Both exist. Follow the help center unless you want the key on your machine. The blog says you need a paid Smartlead plan. The help center has Claude Desktop only; it says the web app is not supported yet. Your agent fetches campaign insights, lead and account data, and deliverability checks. Sending from the agent is not documented on the help center. **Best for:** Cold email reporting in Claude Desktop when you already pay for Smartlead. ### lemlist [lemlist's official MCP](https://developer.lemlist.com/mcp/setup) is hosted at `https://app.lemlist.com/mcp`. OAuth is recommended. You can also send an `X-API-Key` header. The [help center](https://help.lemlist.com/en/articles/13728466-set-up-the-lemlist-mcp-server-in-your-llm-client-oauth-or-api-key) documents Claude, Claude Code, Cursor, ChatGPT and Codex. ChatGPT has a lemlist plugin. With OAuth, do not name the server `lemlist` (lemlist refuses that client name). Claude Code: ```text claude mcp add --transport http lm https://app.lemlist.com/mcp ``` Your agent works on campaigns, leads, inbox, LinkedIn and calls. lemlist can start a campaign. ChatGPT asks you to confirm before a send, a credit spend or a campaign change. **Best for:** Multichannel outbound (email, LinkedIn, calls) with OAuth and an approve step on sends. ## Integration layers [Zapier's Mailchimp MCP](https://zapier.com/mcp/mailchimp) is the Mailchimp app inside [Zapier MCP](https://zapier.com/mcp). You connect Zapier to Claude, ChatGPT or Cursor, connect Mailchimp in Zapier, and the agent finds the action. Zapier lists campaign drafts, Send Campaign, subscribers and reports. Zapier MCP is included in every Zapier plan. Each tool call uses two tasks. [Composio's Klaviyo toolkit](https://composio.dev/toolkits/klaviyo) wraps Klaviyo for agents that already use Composio. Composio lists a free Hobby plan (checked November 2026). Your Klaviyo plan still applies. **Best for:** One connector across many apps, when you already pay for Zapier or Composio. ## How to choose **Ecommerce flows and revenue reporting.** Use [Klaviyo](https://developers.klaviyo.com/en/docs/connect_to_the_klaviyo_mcp_server). **Newsletters for a small business.** Use [MailerLite](https://developers.mailerlite.com/mcp), and send on a paid plan. **Creators.** Use [Kit](https://developers.kit.com/mcp/kit-mcp) if drafts in the chat and sending in Kit is the workflow you want. **Transactional email.** Use [Mailchimp Transactional](https://mailchimp.com/developer/transactional/guides/how-to-use-mailchimps-transactional-messaging-mcp). **Cold email at volume.** Use [Instantly MCP](https://www.manifoldmcp.com/blog/instantly-mcp) or [Smartlead](https://helpcenter.smartlead.ai/en/articles/300-smartlead-mcp-server), matching the platform you already run. **Multichannel outbound.** Use [lemlist](https://developer.lemlist.com/mcp/setup). **Agency with many client accounts.** Use Klaviyo custom connectors with `?company=` on each URL. **One connector across many apps.** Use [Zapier](https://zapier.com/mcp/mailchimp) or [Composio](https://composio.dev/toolkits/klaviyo). If the list is going into a CRM first, [HubSpot MCP](https://www.manifoldmcp.com/blog/hubspot-mcp) and [Attio MCP](https://www.manifoldmcp.com/blog/attio-mcp) cover those workspaces. ## Manifold MCP [Manifold MCP](https://www.manifoldmcp.com/mcp) is hosted, with no API keys of your own, and you pay per call. It does not connect to or send from your email platform. It is the research and list-building server you pair with one of the servers above. Your agent finds companies and the people who work there, then finds and verifies their work emails with [`leads_search_companies`](https://www.manifoldmcp.com/docs/tools/leads#leads_search_companies), [`leads_search_people`](https://www.manifoldmcp.com/docs/tools/leads#leads_search_people), [`leads_get_email`](https://www.manifoldmcp.com/docs/tools/leads#leads_get_email) and [`leads_get_domain_emails`](https://www.manifoldmcp.com/docs/tools/leads#leads_get_domain_emails). It can also read what a market says on Reddit or LinkedIn before it drafts the campaign. See the [leads tools](https://www.manifoldmcp.com/docs/tools/leads), [build a lead list](https://www.manifoldmcp.com/use-cases/build-a-lead-list) and [find work emails](https://www.manifoldmcp.com/use-cases/find-work-emails). For the prospecting servers themselves, see [the best lead generation MCP servers](https://www.manifoldmcp.com/blog/best-lead-generation-mcp-servers). Every workspace gets 250 free credits a month, and Pro starts at $20/mo. Setup is in the [Claude](https://www.manifoldmcp.com/docs/clients/claude) and [ChatGPT](https://www.manifoldmcp.com/docs/clients/chatgpt) docs. **Best for:** Lead research in Claude or ChatGPT, paid per call, next to the email platform you already use. More on this topic sits under [lead research articles](https://www.manifoldmcp.com/blog/topics/leads). ## Run this in your agent Connect Manifold to your agent, then paste this prompt: ```text Find B2B ecommerce brands in the US with 20 to 200 employees. For each, find a Head of Retention or VP of Marketing, get a verified work email, then search Reddit for recent complaints about their current email platform. Return a table I can load into Klaviyo or Instantly. ``` It uses [`leads_search_companies`](https://www.manifoldmcp.com/docs/tools/leads#leads_search_companies), [`leads_search_people`](https://www.manifoldmcp.com/docs/tools/leads#leads_search_people), [`leads_get_email`](https://www.manifoldmcp.com/docs/tools/leads#leads_get_email) and [`reddit_search_posts`](https://www.manifoldmcp.com/docs/tools/reddit#reddit_search_posts). ## Questions people ask ### Does Mailchimp have an official MCP server? Mailchimp has three separate things. The Mailchimp app in Claude and ChatGPT drafts campaigns you launch in Mailchimp, on Standard and Premium plans, in the US, Canada, UK and Australia. Mailchimp Transactional (Mandrill) hosts an MCP at https://mandrillapp.com/mcp that sends transactional mail with a Transactional API key as a Bearer header. A docs MCP at https://mailchimp.com/developer/_mcp/server searches Mailchimp developer docs and does not touch your account. There is no single official Mailchimp marketing MCP that sends newsletter campaigns from the agent. ### Which email MCP servers work in ChatGPT? Klaviyo lists a ChatGPT app. Mailchimp lists a ChatGPT app in the US, Canada, UK and Australia on Standard and Premium. MailerLite's help center installs MailerLite as a ChatGPT plugin. lemlist lists a ChatGPT plugin. Kit and other remote servers can be added as a custom MCP server at chatgpt.com/plugins (Add, then Create custom MCP server) on Plus, Pro, Business, Enterprise and Edu, on the web. Instantly does not document ChatGPT itself. ### Can an MCP server send campaigns for me? It depends on the vendor. MailerLite sends through MCP on paid plans. Brevo's MCP server can send; its Claude connector only drafts. Instantly can create and manage campaigns. lemlist can start campaigns and asks you to confirm before a send. Kit always saves a broadcast draft. Mailchimp's app drafts campaigns you launch in Mailchimp. Mailchimp Transactional sends transactional mail, not marketing campaigns. Klaviyo can create campaigns; set read-only=true on a custom connector if you want writes off. ### Do I need an API key? Not for Klaviyo's remote server, MailerLite, Kit, lemlist with OAuth, or Brevo's listed Claude connector: you sign in. Instantly, Smartlead, Brevo's MCP server and Mailchimp Transactional take an API key. Klaviyo's local server uses PRIVATE_API_KEY. Manifold MCP needs no API keys of your own. ### How do I connect several client accounts? Klaviyo documents one custom connector per account, with ?company= on the URL, for agencies. Kit says additional users on the account can connect their own client with the same access they have as editors. Instantly and Smartlead use an API key per workspace, so each client account needs its own key and its own connector. Check the vendor's own page before you share a key across clients. ## Keep reading - [Attio MCP: how to set it up in Claude, ChatGPT and Cursor](https://www.manifoldmcp.com/blog/attio-mcp.md): Attio hosts an MCP server at mcp.attio.com. This guide covers OAuth setup in Claude, ChatGPT, Claude Code and Cursor, the tool list, prompts that work, rate limits, and the community server on GitHub. - [Instantly MCP: how to set it up in Claude and Cursor](https://www.manifoldmcp.com/blog/instantly-mcp.md): Instantly hosts an MCP server at mcp.instantly.ai. This guide covers the API key, setup in Claude, Cursor, Claude Code and n8n, what the tools can do, prompts that work, and the community package on GitHub. - [HubSpot MCP: how to set it up in Claude, ChatGPT and Cursor](https://www.manifoldmcp.com/blog/hubspot-mcp.md): HubSpot's official MCP server connects Claude, ChatGPT and Cursor to your HubSpot CRM. This guide covers admin setup, how to connect in each client, verification steps, prompts that work well, and when you need complementary research tools.