Form backend that routes: one tool per Postbag API operation, plus quickstart and explain.
Connect Runs on your machine
claude mcp add mcp -e POSTBAG_API_KEY=<POSTBAG_API_KEY> -e POSTBAG_API_URL=<POSTBAG_API_URL> -- npx -y @postbag/[email protected]
{
"mcpServers": {
"mcp": {
"command": "npx",
"args": [
"-y",
"@postbag/[email protected]"
],
"env": {
"POSTBAG_API_KEY": "<POSTBAG_API_KEY>",
"POSTBAG_API_URL": "<POSTBAG_API_URL>"
}
}
}
}
{
"mcpServers": {
"mcp": {
"command": "npx",
"args": [
"-y",
"@postbag/[email protected]"
],
"env": {
"POSTBAG_API_KEY": "<POSTBAG_API_KEY>",
"POSTBAG_API_URL": "<POSTBAG_API_URL>"
}
}
}
}
{
"servers": {
"mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@postbag/[email protected]"
],
"env": {
"POSTBAG_API_KEY": "<POSTBAG_API_KEY>",
"POSTBAG_API_URL": "<POSTBAG_API_URL>"
}
}
}
}
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
POSTBAG_API_KEYRequired, secret | A Postbag API key (pb_live_… or pb_test_…). Mint one at https://postbag.dev/app or with `postbag login`. |
POSTBAG_API_URLOptional | Base URL of the Postbag API. Defaults to https://postbag.dev — set this only for a self-hosted instance. |
Details
| Package | @postbag/[email protected] (NPM, stdio) |
| First published | 21 Aug 2026 |
| Last updated | 21 Aug 2026 |
| Registry name | dev.postbag/mcp |
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