ZeroSMTP MCP Server: Install & Setup

Install ZeroSMTP in Claude Code

Claude Code

claude mcp add zerosmtp -- npx -y zerosmtp-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "zerosmtp": {
      "command": "npx",
      "args": [
        "-y",
        "zerosmtp-mcp"
      ]
    }
  }
}

Frequently asked questions

What does the ZeroSMTP MCP server do?

A free SMTP relay that still takes a username and password, for devices that cannot do OAuth 2.0.

Is the ZeroSMTP MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does ZeroSMTP run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add ZeroSMTP to Claude Code?

Run: claude mcp add zerosmtp -- npx -y zerosmtp-mcp

More security & identity MCP servers

View all

Agentleak

yagobski/agentleak

Local privacy testing for AI agents: scan code for PII and secrets, score execution traces across internal channels, redact text, and track new or fixed findings through MCP tools.

LocalFreePython

Visus

1315

visus-mcp/visus-mcp

Security-first web access for Claude. Sanitizes pages, blocks injection, redacts PII.

LocalFree

Hexforge Gateway

boy-offi9-inc/hexforge-gateway

APK reverse engineering workspace that orchestrates jadx, apktool, adb and Frida through a workflow engine, on Termux (Android) or PC.

LocalAccount neededTypeScript

pkgxray

12265

adamsjack711-ux/pkgxray

Pre-install security scans for npm packages, MCP servers, and AI agents with cited verdict evidence.

LocalFree

Opnsense

coreyhines/opnsense-mcp

OPNsense firewall operations via API: query ARP, DHCP, firewall rules, logs, interfaces, system status and packet captures.

LocalAccount neededPython

MobiLoop

enessubass/mobiloop-mcp

Guarded AI mobile Appium testing, security scanning, verification, and fix-retest MCP tools.

LocalFree