lumberjack.conf

{
        "network": {
                "servers": [ "loki-test-01.iad.company.com:6782" ],
                "ssl ca": "/etc/logstash-forwarder/ca.crt",
                "timeout": 15
        },
        "files": [
                {
                        "paths": [ "/usr/local/psa/var/log/maillog" ],
                        "fields": { "type": "postfix" }
                }
        ]
}