#!/usr/bin/perl -w
=head1 NAME

relay_only - this plugin only permits relaying

=head1 SYNOPSIS

# in config/plugins

check_relay

relay_only

# other rcpt hooks go here

=head1 DESCRIPTION

This plugin can be used for the case where a server is used as the smart
relay host for internal users and external/authenticated users, but should
not be considered a normal inbound MX server

It should be configured to be run _AFTER_ check_relay and before other
RCPT hooks!  Only clients that have authenticated or are listed in the
relayclient file will be allowed to send mail.

=cut

sub hook_rcpt {
  if ( shift->qp->connection->relay_client ) {
    return (OK);
  }
  else {
    return (DENY);
  }
}