## Postfix

### SNMP Extend

1. Copy the shell script, postfix-queues, to the desired host

    ```bash
    wget https://github.com/librenms/librenms-agent/raw/master/snmp/postfix-queues -O /etc/snmp/postfix-queues
    ```

2. Copy the Perl script, postfixdetailed, to the desired host

    ```bash
    wget https://github.com/librenms/librenms-agent/raw/master/snmp/postfixdetailed -O /etc/snmp/postfixdetailed
    ```

3. Make both scripts executable

    ```bash
    chmod +x /etc/snmp/postfixdetailed /etc/snmp/postfix-queues
    ```

4. Edit your snmpd.conf file and add:

    ```bash
    extend mailq /etc/snmp/postfix-queues
    extend postfixdetailed /etc/snmp/postfixdetailed
    ```

5. Restart snmpd.

    ```bash
    sudo systemctl restart snmpd
    ```

6. Install pflogsumm for your OS.

7. Make sure the cache file in `/etc/snmp/postfixdetailed` is some place
that snmpd can write too. This file is used for tracking changes
between various values between each time it is called by snmpd. Also
make sure the path for pflogsumm is correct.

8. Run `/etc/snmp/postfixdetailed` to create the initial cache file so
you don't end up with some crazy initial starting value. 

!!! note 
    that each time `/etc/snmp/postfixdetailed` is ran, the cache file is
    updated, so if this happens in between LibreNMS doing it then the
    values will be thrown off for that polling period.

The application should be auto-discovered as described at the top of
the page. If it is not, please follow the steps set out under `SNMP
Extend` heading top of page.

!!! note Redhat
    If using RHEL for your postfix server, `qshape` must be installed manually as it is not officially supported. CentOs 6 rpms seem to work without issues.