#! /bin/bash

# if /etc/tcpserver/smtp.rules does not already exist,
# create it with some reasonable defaults

dest=$1

: ${dest:=/etc/tcpserver/smtp.rules}

install -d $( dirname $dest )

if test -r $dest ; then
  1>&2 echo "Oops, destination '$dest' already exists."
  exit 1
fi

<<EoF cat > $dest
10.:allow,RELAYCLIENT=""
127.0.0.:allow,RELAYCLIENT=""
:allow
EoF