Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun

claude mcp add --transport http letterkeel-send-email-via-smtp-resend-se 'https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry' --header 'Authorization: <AUTHORIZATION>'

~/.codex/config.toml

[mcp_servers.letterkeel-send-email-via-smtp-resend-se]
url = "https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry"
http_headers = { Authorization = "<AUTHORIZATION>" }

# codex mcp add letterkeel-send-email-via-smtp-resend-se --url 'https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry'

~/.cursor/mcp.json

{
  "mcpServers": {
    "letterkeel-send-email-via-smtp-resend-se": {
      "url": "https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry",
      "headers": {
        "Authorization": "<AUTHORIZATION>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "letterkeel-send-email-via-smtp-resend-se": {
      "type": "http",
      "url": "https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry",
      "headers": {
        "Authorization": "<AUTHORIZATION>"
      }
    }
  }
}

~/.gemini/settings.json

{
  "mcpServers": {
    "letterkeel-send-email-via-smtp-resend-se": {
      "httpUrl": "https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry",
      "headers": {
        "Authorization": "<AUTHORIZATION>"
      }
    }
  }
}

claude_desktop_config.json · Customize › Connectors › Add custom connector

{
  "mcpServers": {
    "letterkeel-send-email-via-smtp-resend-se": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry",
        "--header",
        "Authorization:<AUTHORIZATION>"
      ]
    }
  }
}

.trae/mcp.json

{
  "mcpServers": {
    "letterkeel-send-email-via-smtp-resend-se": {
      "url": "https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry",
      "headers": {
        "Authorization": "<AUTHORIZATION>"
      }
    }
  }
}