INDIVIDUAL MCP TOOL

preview_inbox

Show how a cold email's sender name, subject line and preview text are cut off in Gmail desktop, Gmail mobile and Outlook, with warnings (no sender name, all caps, empty preview, etc.

warminboxes.comnone authenticationAvailability not checked

LIVE ENDPOINT

https://warminboxes.com/mcp

No auth detected

Connect to this endpoint to inspect the live schema for preview_inbox and invoke it with your own arguments.

Indexed input schema

{}

Risk classification

Potential side effects detected · medium confidence · heuristic, not a guarantee.

A tool name or description suggests sending messages.

Parent server

warminboxes.com

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.warminboxes-deliverability-tools]
url = "https://warminboxes.com/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "warminboxes-deliverability-tools": {
      "type": "http",
      "url": "https://warminboxes.com/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: warminboxes-deliverability-tools
Remote MCP URL: https://warminboxes.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "warminboxes-deliverability-tools": {
      "url": "https://warminboxes.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "warminboxes-deliverability-tools": {
      "type": "http",
      "url": "https://warminboxes.com/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "warminboxes-deliverability-tools",
  "transport": "streamable-http",
  "url": "https://warminboxes.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

Related tools

check_deliverability — Grade a domain A-F for cold email readiness.
check_spf — Look up a domain's SPF record and validate it, including the recursive DNS lookup count that silently breaks SPF past 10.
check_dkim — Find and validate a domain's DKIM signing key, including key strength.
check_dmarc — Look up and parse a domain's DMARC record: policy, subdomain policy, percentage, alignment and reporting tags, each explained.
check_bimi — Validate a domain's BIMI record, the logo SVG, the VMC, and the DMARC enforcement level Gmail requires before it will show a brand logo.
check_mta_sts — Validate a domain's _mta-sts DNS record and its published policy file: mode, MX patterns, max_age and TLS-RPT.
check_ssl — Read a host's TLS certificate: issuer, validity dates and days remaining, subject alternative names, key type and size, signature algorithm, chain, negotiated protocol and whether the chain is trusted and covers the hostname.
check_dns — Query any DNS record type for a domain: MX, TXT, A, AAAA, CNAME, NS, SOA, CAA.