Hi,

I'm currently trying SL6 with postfix for local mail delivery (no "real" mail 
server).

But I am wondering, why the sender is always "[log in to unmask]"? In 
/etc/postfix/main.cf is everything on it's default. "myhostname" is not set, 
what should postfix make getting the hostname via gethostname() as written in 
the comments.

A hostname and search domain is configured for the system:
# hostname -f
vm01.test.local

I know, I can set "myhostname", but why isn't postfix getting this by itself?

Regards,
Marc