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