Cold Email MCP Server

by bluecraft-ai Your server? Claim it

answering

Cold Email is answering right now. Last checked 13 min ago. It exposes 6 tools. Last commit 1 Mar 2026.

Generate hyper-personalized cold email sequences via AI.

Uptime history 47 days of history · worst day 99%

47 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

611 ms

Response time

average over 24h

Stars

last commit 1 Mar 2026

Nothing serious here today

Today is the operative word: we check Cold Email every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add cold-email --transport http https://mcp.machfive.io/mcp/{api_key}

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "cold-email": {
      "url": "https://mcp.machfive.io/mcp/{api_key}"
    }
  }
}

~/.codex/config.toml

[mcp_servers.cold-email]
url = "https://mcp.machfive.io/mcp/{api_key}"

.cursor/mcp.json

{
  "mcpServers": {
    "cold-email": {
      "url": "https://mcp.machfive.io/mcp/{api_key}"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "cold-email": {
      "url": "https://mcp.machfive.io/mcp/{api_key}"
    }
  }
}

Available tools 6

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

generate

generate_batch

Submit multiple leads for batch email sequence generation (ASYNC). Returns IMMEDIATELY with a list_id. Processing runs in the background. After calling this, poll get_list_status every 15-30 seconds until processing_status is 'completed' or 'failed', then call export_list. You must have a campaign_id first. Call list_campaigns if you don't have one.

generate_sequence

Generate a personalized cold email sequence for ONE lead. This is SYNCHRONOUS — the request takes 3-10 minutes because MachFive researches the prospect and crafts unique emails. Do NOT retry if it seems slow; wait for the response. You must have a campaign_id first. Call list_campaigns if you don't have one. If the request times out, use the returned list_id with get_list_status and export_list to recover results.

campaigns

list_campaigns

List campaigns in the user's MachFive workspace. CALL THIS FIRST before generate_sequence or generate_batch — you need a campaign ID to generate emails. If the user hasn't specified a campaign, call this and ask them to pick one. Returns JSON array of campaigns with id, name, and created_at. Use the 'id' field as campaign_id in generate calls.

export

export_list

Download the generated email sequences for a COMPLETED list. Only call this AFTER get_list_status shows processing_status = 'completed'. If the list is not yet completed, you'll get a 409 error — poll first.

lists

list_lists

List lead lists (batch jobs) in the user's MachFive workspace. Useful for browsing past batches, checking what's in progress, or finding a list_id to export. Results are ordered newest first.

status

get_list_status

Check the processing status of a lead list. Use this to POLL after calling generate_batch. Call every 15-30 seconds until processing_status is 'completed' or 'failed'. When completed, call export_list. When failed, submit a new batch.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.machfive.io/mcp/{api_key}	streamable-http	answering	544 ms	13 min ago

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Cold Email — questions

Answers built from our own checks of this server.

What can Cold Email do?

It exposes 6 tools, read directly from the server on our last check. Among them: export_list, generate_batch, generate_sequence, get_list_status, list_campaigns, list_lists. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Cold Email working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 611 ms. The bar chart above shows every period we have measured.

How do I connect Cold Email?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Cold Email need an API key?

No. Cold Email completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Cold Email?

It answers our handshake in 611 ms on average, which is faster than 21% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Cold Email open source?

Yes — it is published under the MIT licence, written in Python and 2 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.