[syslog-ng] valid HOSTNAME characters in syslog?

[dave]

What is the source of information for syslog-ng to
treat '@' a valid character in HOSTNAME field of
syslog message?

RFC 3164 refers to another RFC for the validity of
HOSTNAME field. Syslog-ng's Syslog Relay treats '@' a
valid HOSTNAME character while forwarding syslog. 

I am trying to find valid character set to be used in
HOSTNAME field of syslog message. So that I would know
when a Syslog Relay inserts a new HOSTNAME/IP in the
syslog message to be forwarded.

Appreciate any pointers.


       
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