<!--
title: Children Protection for Postfix-based EMail-Server
date: 2013-06-27
-->

This small tool implements a whitelist on a Postfix mail-server. It prevents certain recipient addresses (your kids ones) from
receiving mail from any not whitelisted address. Any mail from not whitelisted senders is redirected to a delegate (a parent).

The code for this tool can is here: [https://gitea.hottis.de/wn/childprot](https://gitea.hottis.de/wn/childprot).

Configure the tool by adding this line into the `master.cf` of the Postfix installation:

```
childprot unix -   n    n    -    25    spawn user=mail argv=/opt/sbin/ChildProt
```

and this one to the `main.cf`:

```
check_policy_service unix:private/childprot
```

The restricted recipients and the whitelists are stored in an SQLite3 database:

```
CREATE TABLE child_address_t (
  child INTEGER REFERENCES child_t(id),
  address TEXT
);

CREATE TABLE child_t (
  id INTEGER PRIMARY KEY,
  name TEXT,
  delegate TEXT
);

CREATE TABLE whitelist_t (
  child INTEGER REFERENCES child_t(id),
  address TEXT
);

CREATE VIEW child_v AS
  SELECT c.id as id,
         c.delegate as delegate,
         ca.address as address
  FROM child_t c,
       child_address_t ca
  WHERE c.id = ca.child;
```

Restricted persons together with their delegates are added to the table `child_t`, multiple addresses can be assigned to those persons in
`child_address_t`. Whitelists per person are maintained in `whitelist_t`.

The tool is querying the view `child_v`.

**Note: The code is unmaintained and here only for documentary reasons. It is not meant to be used any longer.**