[syslog-ng] host related macros

Hi, I have a hard time understanding the behaviour of the multiple host based macros with respect to the value of the use-fqdn(), and keep-hostname() params. First of all, when setting use-fqdn(yes), isn't the network destination supposed to send the fqdn? In our case, tcpdump shows that the short hostname is sent instead. Additionally, what does the following paragraph from the documentation mean? The hostname-related macros (${FULLHOST}, ${FULLHOST_FROM}, ${HOST}, and ${HOST_FROM}) do not have any effect if the keep-hostname() option is disabled Does that mean they are empty if keep-hostname(no) ? Cheers