# Welcome

**postfix-policy-server** (or short: **pps**) provides a simple framework to create [Postfix SMTP Access Policy Delegation Servers](http://www.postfix.org/SMTPD_POLICY_README.html) in Go.

## Installation

First of all, [download](https://golang.org/dl/) and install Go. `1.17` or higher is required.

Installation can be done using the `go get` command:

```bash
$ go get -u github.com/wneessen/postfix-policy-server
```

## **Usage**

The **pps** framework allows you to start a new TCP (or other Go `net.Listener`) server that listens for incoming policy requests from a Postfix mail server. 

Once a new connection is established and the dataset from Postfix has been sent, the data will be processed as a [PolicySet](https://pkg.go.dev/github.com/wneessen/postfix-policy-server#PolicySet) and handed to a provided `Handle()` method that is given by the user, using the **pps** [Handler](https://pkg.go.dev/github.com/wneessen/postfix-policy-server#Handler) interface.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://pps-docs.pebcak.de/master.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.