# Postfix collector Monitors MTA email queue statistics using [postqueue](http://www.postfix.org/postqueue.1.html) tool. The collector executes `postqueue -p` to get Postfix queue statistics. ## Requirements Postfix has internal access controls that limit activities on the mail queue. By default, all users are allowed to view the queue. If your system is configured with stricter access controls, you need to grant the `netdata` user access to view the mail queue. In order to do it, add `netdata` to `authorized_mailq_users` in the `/etc/postfix/main.cf` file. See the `authorized_mailq_users` setting in the [Postfix documentation](https://www.postfix.org/postconf.5.html) for more details. ## Charts It produces only two charts: 1. **Postfix Queue Emails** - emails 2. **Postfix Queue Emails Size** in KB - size ## Configuration Configuration is not needed. ### Troubleshooting To troubleshoot issues with the `postfix` module, run the `python.d.plugin` with the debug option enabled. The output will give you the output of the data collection job or error messages on why the collector isn't working. First, navigate to your plugins directory, usually they are located under `/usr/libexec/netdata/plugins.d/`. If that's not the case on your system, open `netdata.conf` and look for the setting `plugins directory`. Once you're in the plugin's directory, switch to the `netdata` user. ```bash cd /usr/libexec/netdata/plugins.d/ sudo su -s /bin/bash netdata ``` Now you can manually run the `postfix` module in debug mode: ```bash ./python.d.plugin postfix debug trace ```