What is the key difference between Postmancer and SendLetter?

Postmancer belongs to the Developer Tools category with local stdio execution, while SendLetter belongs to the Developer Tools category with local stdio execution.

How do I install Postmancer or SendLetter in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Postmancer and SendLetter free or paid?

Postmancer operates under a Free / Open Source model (No auth required). SendLetter operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Postmancer lists 7 tools with 2 views and 28 GitHub stars. SendLetter lists 0 tools with 0 views and 0 GitHub stars.

Can I use both Postmancer and SendLetter together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

How do I install Postmancer or SendLetter in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are Postmancer and SendLetter free to use, or do they require API keys?

Postmancer is listed under a Free / Open Source model with No auth required . SendLetter operates under a Free / Open Source model with No auth required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both Postmancer and SendLetter at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both hijaz-postmancer and sendletter as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, Postmancer has a Quality Score of 60 /100 ( Good ) with 2 views, 0 installs, and 28 GitHub stars. SendLetter holds a Quality Score of 27 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Postmancer vs SendLetter

In-depth architectural comparison of the Postmancer and SendLetter MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Postmancer

Developer Tools · Local stdio

Quality: 60/100 (Good) | Auth: No auth required

SendLetter

Developer Tools · Local stdio

Quality: 27/100 (Emerging) | Auth: No auth required

Verdict Summary: Choose Postmancer if you need specialized Developer Tools tools running via a local process. Choose SendLetter if your workspace requires Developer Tools integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Postmancer when:

You need dedicated capabilities in the Developer Tools domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: COLLECTIONS_PATH, LOG_LEVEL, POSTMANCER_ENCRYPTION_KEY, ENCRYPTION_KEY.
Primary tools included: http_request, list_collections, list_requests.

Explore Postmancer Details

Choose SendLetter when:

You need dedicated capabilities in the Developer Tools domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore SendLetter Details

Feature & Specification Comparison

Specification	Postmancer hijaz Developer Tools	S SendLetter Developer Tools
Summary	A MCP server for replacing Rest Clients like Postman/Insomnia, by allowing your LLM to maintain and use api collections.	Send real, printed letters by post across Europe. Requires a free account; quote before sending.
Category & Scope	Developer Tools	Developer Tools

Tools & Capabilities Breakdown

Postmancer Tools (7)

http_request

Send HTTP requests to any URL

list_collections

View all your saved API collections

list_requests

View all requests in a collection

save_request

Save a request to a collection

request_from_collection

Execute a saved request

set_environment_variable

Set variables for request templates

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Postmancer Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "hijaz-postmancer": {
      "command": "npx",
      "args": [
        "-y",
        "npx"
      ],
      "env": {
        "COLLECTIONS_PATH": "YOUR_COLLECTIONS_PATH_HERE",
        "LOG_LEVEL": "YOUR_LOG_LEVEL_HERE",
        "POSTMANCER_ENCRYPTION_KEY": "YOUR_POSTMANCER_ENCRYPTION_KEY_HERE",
        "ENCRYPTION_KEY": "YOUR_ENCRYPTION_KEY_HERE"
      }
    }
  }
}

SendLetter Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

Postmancer is categorized under Developer Tools and uses a local stdio subprocess. In contrast, SendLetter belongs to Developer Tools using local stdio subprocess. Select Postmancer when you need capabilities focused on developer tools and SendLetter when you require tools for developer tools.

More alternatives to Postmancer More alternatives to SendLetter Developer Tools category hub