Postbag runs on your own machine — the client starts it, so there is no endpoint to ping. 33 installs a week from npm. Last commit 21 Sep 2026.
Form backend that routes: one tool per Postbag API operation, plus quickstart and explain.
What the code does
We read the source, 3 d ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
const response = await fetch(`https://api.telegram.org/bot${config.bot_token}/sendMessage`, {
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mcp -e 'POSTBAG_API_KEY=<POSTBAG_API_KEY>' -- npx -y @postbag/mcp{
"mcpServers": {
"mcp": {
"command": "npx",
"args": [
"-y",
"@postbag/mcp"
],
"env": {
"POSTBAG_API_KEY": "<POSTBAG_API_KEY>"
}
}
}
}[mcp_servers.mcp]
command = "npx"
args = ["-y", "@postbag/mcp"]
env = { POSTBAG_API_KEY = "<POSTBAG_API_KEY>" }{
"mcpServers": {
"mcp": {
"command": "npx",
"args": [
"-y",
"@postbag/mcp"
],
"env": {
"POSTBAG_API_KEY": "<POSTBAG_API_KEY>"
}
}
}
}{
"servers": {
"mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@postbag/mcp"
],
"env": {
"POSTBAG_API_KEY": "<POSTBAG_API_KEY>"
}
}
}
}Put your own value in place of
<POSTBAG_API_KEY> (A Postbag API key (pb_live_… or pb_test_…). Mint one at https://postbag.dev/app or with `postbag login`).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
POSTBAG_API_URL (Base URL of the Postbag API. Defaults to https://postbag.dev — set this only for a self-hosted instance).
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Postbag — questions
Answers built from our own checks of this server.