coldsend-mcp-server 0.1.5

ColdSend MCP Server - AI-native email campaign management via Model Context Protocol

ColdSend MCP Server

AI-Native Email Campaign Management via Model Context Protocol

ColdSend MCP Server enables AI assistants like Claude Desktop, Claude Code, Cursor IDE, Windsurf, OpenCode, and other MCP-compatible clients to manage cold email campaigns through natural language.

The server supports dual transport — Streamable HTTP (modern) and SSE (legacy) — for maximum client compatibility.

Installation

pip install coldsend-mcp-server

Quick Start

You only need your ColdSend API key to get started.

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "coldsend": {
      "command": "coldsend-mcp",
      "env": {
        "X-API-Key": "your-coldsend-api-key"
      }
    }
  }
}

Claude Code

claude mcp add coldsend https://mcp.coldsend.pro/mcp -t http -e X-API-Key=your-api-key

Cursor IDE / Windsurf

1. Open Settings -> MCP
2. Add new MCP server:
   • Name: ColdSend
   • Type: http (Streamable HTTP)
   • URL: https://mcp.coldsend.pro/mcp
   • Headers: X-API-Key: your-api-key

OpenCode

Add to your opencode.jsonc:

{
  "mcp": {
    "coldsend": {
      "type": "remote",
      "url": "https://mcp.coldsend.pro/sse",
      "enabled": true,
      "headers": {
        "X-API-Key": "{env:COLDSEND_API_KEY}"
      }
    }
  }
}

Remote Server (No Installation Required)

You can connect directly to the hosted server without installing anything. Two transport endpoints are available:

Transport	URL	Use With
Streamable HTTP	https://mcp.coldsend.pro/mcp	Claude Code, Cursor, VS Code, Smithery
SSE (legacy)	https://mcp.coldsend.pro/sse	OpenCode, older clients

Header: X-API-Key: your-api-key

Available Tools

Campaign Management

Tool	Description
create_campaign	Create a new email campaign
list_campaigns	List all campaigns with filtering
get_campaign	Get specific campaign details
update_campaign	Update campaign configuration
pause_campaign	Pause an active campaign
activate_campaign	Activate/resume a campaign
resume_campaign	Resume a paused campaign
delete_campaign	Delete a campaign permanently

Lead Management

Tool	Description
upload_leads_csv	Upload leads from CSV
list_leads	List leads in a campaign
delete_lead	Remove a lead
get_lead_stats	Get lead statistics

Analytics & Metrics

Tool	Description
get_campaign_analytics	Comprehensive campaign analytics
get_account_metrics	Account-level metrics and quotas
get_inbox_performance	Inbox performance analysis
compare_campaigns	Compare multiple campaigns

Domain Management

Tool	Description
list_domains	List all domains with verification status
get_domain	Get domain details with DNS records
add_domain	Add new domain for verification
verify_domain_dns	Trigger DNS verification check
get_domain_activation_progress	Check setup progress
delete_domain	Delete domain permanently

Sender Account Management

Tool	Description
list_sender_accounts	List all sender inboxes
create_coldsend_inbox	Create ColdSend native inbox
create_smtp_inbox	Create custom SMTP inbox (BYOC)
send_test_email	Send test email to verify configuration
pause_inbox	Pause inbox temporarily
resume_inbox	Resume paused inbox
delete_inbox	Delete inbox permanently
get_inbox_health	Get detailed health report

Example Interactions

Creating a Campaign:

Create a new campaign called "Q1 Outreach" starting January 15th with a daily limit of 100 emails.

Checking Performance:

How is my Q1 Outreach campaign performing?

Uploading Leads:

Upload these leads to my Q1 Outreach campaign: [paste CSV]

Managing Domains:

Add the domain outreach.acme.com and show me the DNS records I need to configure.

Inbox Health:

Check the health of all my sender inboxes and flag any issues.

Authentication

The MCP server uses API key authentication. Pass your ColdSend API key via the X-API-Key header — the server forwards it securely to the ColdSend API.

Get your API key from your ColdSend dashboard.

Smithery

This server is also available on Smithery if you prefer to use it from there.

Transport Endpoints

The server exposes two transport protocols on different paths:

Path	Transport	Description
/mcp	Streamable HTTP	Modern MCP transport (recommended)
/sse	SSE	Legacy transport for older clients
/messages	SSE POST	Message endpoint for SSE transport
/health	HTTP GET	Health check for Kubernetes probes
/	HTTP GET	Service info with transport discovery

Configuration

The server works out of the box with sensible defaults. All configuration is optional:

Environment Variable	Default	Description
COLDSEND_API_URL	https://api.coldsend.pro/api/public/v1	ColdSend API endpoint
MCP_PORT	8080	Server port
LOG_LEVEL	INFO	Logging level

Requirements

• Python 3.11+

Links

• Website: coldsend.pro
• API Docs: docs.coldsend.pro
• Support: [e-mail]

License

MIT License - see LICENSE for details.

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Built with Model Context Protocol by the ColdSend Team