Comment 2 for bug 800833

Error from log:

Starting amavisd: head: impossibile aprire "/etc/mailname" per la lettura: File o directory non esistente
  The value of variable $myhostname is "andrea-MS-7100", 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!
(failed).
invoke-rc.d: initscript amavis, action "restart" failed.