Comparison, Cold email, Tools
Cold Email Tools With an MCP Server for Claude and ChatGPT (2026)
Most big cold email tools now run their own MCP server, so Claude or ChatGPT can work in your account. They differ in how you sign in, which AI apps they support, and whether the free plan can use them.
5 min read
Summarize with AI
In this article
In 2026 Warmerly, Instantly, Smartlead, lemlist, Reply.io, Saleshandy, Apollo, Woodpecker, Hunter and Snov.io all run their own MCP server, so an AI assistant such as Claude or ChatGPT can work in your account. We found no official one for Mailshake. Warmerly, Hunter and Snov.io say their MCP server works on every plan, including the free one. Smartlead's works only over SSE with an API key in the URL, in Claude Desktop for now.
Cold email MCP servers compared
| Tool | MCP server address | How you sign in | Which plans |
|---|---|---|---|
| Warmerly | https://app.warmerly.com/api/mcp | OAuth (sign in and approve) | Every plan, including Free |
| Instantly | mcp.instantly.ai | API key, in a header or the URL | Not stated |
| Smartlead | mcp.smartlead.ai/sse (SSE only) | API key in the URL | Not stated |
| lemlist | https://app.lemlist.com/mcp | OAuth or API key | Not stated |
| Reply.io | https://mcp.reply.io/ | Personal API key or OAuth | Not stated |
| Saleshandy | https://mcp.saleshandy.com/mcp | OAuth or API key | Plans with API access, no extra charge |
| Apollo | https://mcp.apollo.io/mcp | OAuth | Not stated; uses Apollo credits |
| Woodpecker | Hosted by Woodpecker, or Docker | Sign-in flow (hosted) or API key (Docker) | Docker needs the API & Integration add-on |
| Hunter | https://mcp.hunter.io/mcp | OAuth or API key | Every plan |
| Snov.io | https://mcp.snov.io/mcp | OAuth | Every plan, including the free Trial |
| Mailshake | No official server found | Third-party connectors only | Not applicable |
What to look for in a cold email MCP server
- Sign-in by OAuth. You approve access in the browser and never paste a key into a chat app. An API key in the URL, as with Smartlead's, can end up in config files and logs.
- Your AI app. Woodpecker's hosted server lists Claude, Claude Code, ChatGPT Desktop and Codex CLI; lemlist's lists Claude, ChatGPT, Cursor and Grok. Smartlead's works in Claude Desktop only for now.
- Your plan. Saleshandy ties MCP to plans with API access, and Woodpecker's Docker route needs a paid add-on. Warmerly, Hunter and Snov.io allow it on their free plans.
- What the tools can do. Finding leads, building and launching campaigns, and answering replies are different jobs, so check the tool list before you connect.
Warmerly's MCP server
Warmerly's MCP server lets Claude, ChatGPT, Claude Code or Cursor find leads, build and launch campaigns, check a domain's SPF, DKIM and DMARC, and read and answer replies in your workspace. You add https://app.warmerly.com/api/mcp as a custom connector and sign in; there is no API key or add-on. It works on every plan, including Free, so you can try it without paying. The setup steps for each AI app are in the Warmerly docs.
Frequently asked questions
Which cold email tools work with Claude?
Warmerly, Instantly, Smartlead, lemlist, Reply.io, Saleshandy, Apollo, Woodpecker, Hunter and Snov.io all run an official MCP server that Claude can connect to. Smartlead's currently works in Claude Desktop only.
Can I use a cold email MCP server on a free plan?
Warmerly, Hunter and Snov.io say their MCP server is available on every plan, including the free one. Saleshandy includes MCP only with plans that have API access.