https://github.com/haraka/Haraka

| LOG_LEVEL | Sets Log Level - Values:EMERG,ALERT,CRIT,ERROR,WARN,NOTICE,INFO,DEBUG,PROTOCOL,DATA - Default: INFO | | ACCEPT_DOMAINS | Deliminited List of domains to accept mail for e.g. example.com example2.com | HOSTNAME | The hostname you wish to advertise e.g. host.example.com |