# Run Cold Email From Claude or ChatGPT: What Works and What Stays Manual

URL: https://warmerly.com/blog/run-cold-email-from-claude-or-chatgpt
Published: 2026-10-15
Reading time: 5 minutes
Tags: AI, Cold email, Guides

> Connect Claude or ChatGPT to Warmerly over MCP to find leads, draft campaigns, check deliverability and triage replies. See what it does and what you approve.

You can run most of a cold email workflow from Claude or ChatGPT by connecting Warmerly's MCP server: the assistant can search for leads, create a draft campaign and write its sequence, check a domain's SPF, DKIM and DMARC, run a placement test, and draft replies to your inbox. It cannot start or resume a campaign. Warmerly returns a readiness check and a link, and you press Launch yourself, so nothing is mailed until you decide.

> **Where this comes from**: Everything below is taken from Warmerly's own MCP documentation and code. We make Warmerly. If you are comparing tools rather than setting one up, read which cold email platforms have an MCP server.

## How to connect Claude or ChatGPT to Warmerly

1. Add https://app.warmerly.com/api/mcp as a custom connector. In claude.ai that is Settings, Connectors, Add custom connector. In ChatGPT it is Settings, Apps & Connectors, with Advanced or Developer mode turned on if you do not see the option to add an MCP server.
2. Sign in with your normal Warmerly login when prompted. There is no API key and no add-on, and it works on every plan, including Free.
3. On the consent screen, choose One workspace (the default) or All my workspaces. You can see and revoke each connection under Settings, Connected apps.

ChatGPT's connector option depends on your ChatGPT plan; if you do not see it, it is not enabled on yours. Claude Code and Cursor connect to the same address, and the setup steps for each are in the Warmerly docs.

## What the assistant can do in Warmerly

**What a connected assistant can and cannot do in Warmerly, from the MCP documentation**
| Job | What the assistant can do | What stays with you |
| --- | --- | --- |
| Find leads | Search Warmerly's lead database with a plain-English query, count matches, and add them or your own list to a campaign | Adding leads sends nothing; the lead export allowance on your plan still applies |
| Build a campaign | Create a draft campaign and set its sequence of steps | Reading the sequence before anything goes out |
| Launch | Check the campaign is ready and return the link to it | Pressing Launch or Resume in Warmerly. No tool can start sending |
| Deliverability | Check SPF, DKIM, DMARC and MX for any domain, read a mailbox's health history, run a placement test, turn warmup on or off | Fixing DNS records at your registrar |
| Replies | List conversations, draft a reply, label a message as lead, not relevant or spam | Approving the exact message; a reply is sent only after you approve it |
| Mailbox setup | Give you the link to connect a mailbox | Entering mailbox credentials yourself; they never pass through the AI app |

## Why it cannot launch a campaign

Warmerly has no tool that starts or resumes a campaign, and it will not get one. An assistant that can find leads and launch a campaign could mass-mail people who never opted in. So the assistant prepares the campaign and gets a readiness check and the campaign's link, and a person presses Launch. We think that is the right limit for cold email: an assistant can do the preparation, and a person takes responsibility for the send.

## The guardrails that apply to every call

- The same plan limits and quotas as the dashboard. A call is refused under the conditions a dashboard click would be.
- The billing lock applies. If the workspace is locked, anything that sends or changes something is refused, while reading and actions that reduce activity, such as pausing a campaign, still work.
- The suppression list is enforced. A reply sent through the assistant never reaches an address that unsubscribed or bounced.
- Rate limits per connection, with a tighter budget for anything that sends.
- Every change an assistant makes is recorded in the workspace's audit log with the app's name.

## Four prompts worth starting with

Warmerly ships four ready-made prompts that clients show as slash commands: an account checkup, reply triage, a campaign launch walk-through and a deliverability check. Each one ends by asking you to confirm before it sends, launches or adds leads. For Claude, Warmerly also publishes four skills (launch outreach campaign, deliverability doctor, reply triage and transactional email setup) in an open-source plugin.

Not sure where to start? Ask the assistant to give your workspace a checkup and tell you what is missing. It reads your plan, mailboxes and setup gaps and lists what to fix first.

## When this is not the right tool

If you want an assistant that sends a whole campaign unattended, Warmerly will not do that by design. MCP also needs a Claude or ChatGPT setup that allows custom connectors, so check your plan on the AI side first. And an assistant is only as good as the lead list and the offer you give it.

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Source: https://warmerly.com/blog/run-cold-email-from-claude-or-chatgpt
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