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content/snippets/0050-email-childprot.md

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+<!--
+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.**
+
+