add note about redirecting logs to syslog

content/3.features/logging.md

@@ -6,6 +6,24 @@ category: Features
 
 All Postal processes log to STDOUT and STDERR which means their logs are managed by whatever engine is used to run the container. In the default case, this is Docker. 
 
+## Redirecting logs to the host syslog
+
+If you want to send your log data to the host system's syslog then you can configure this. This is useful if you wish to use external tools like `fail2ban` to block users from accessing your system.
+
+The quickest way to achieve this is to use a docker compose overide file in `/opt/postal/install/docker-compose.overide.yml`. The contents of this file, would contain the following:
+
+```yaml
+version: "3.9"
+services:
+  smtp:
+    logging:
+      driver: syslog
+      options:
+        tag: postal-smtp
+```
+
+If you wanted to put worker and web server logs there too, you can define those. The example above demonstrates using the `smtp` server process.
+
 ## Limiting the size of logs
 
 Docker cam be configured to limit the size of the log files it stores. To avoid storing large numbers of log files, you should configure this appropriately. This can be achieved by setting a maximum size in your `/etc/docker/daemon.json` file.