Comment 2 for bug 806237

Error from log:

Starting amavisd: head: cannot open `/etc/mailname' for reading: No such file or directory
hostname: Name or service not known
  The value of variable $myhostname is "", 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.
dpkg: error processing amavisd-new-postfix (--configure):
 subprocess installed post-installation script returned error exit status 1