Starting amavisd:   The value of variable $myhostname is "myserver", but should have been
  a fully qualified domain name; perhaps uname(3) did not provide such.
  You must explicitly assign a FQDN of this host to variable $myhostname
  in /etc/amavis/conf.d/05-node_id, or fix what uname(3) provides as a host's 
  network name!

~ # vi /etc/amavis/conf.d/05-node_id
        $myhostname = "";

~ # service  amavis restart

    Stopping amavisd: (not running).
    Starting amavisd: amavisd-new.