Binary package “nullmailer” in ubuntu intrepid

simple relay-only mail transport agent

 Nullmailer is a replacement MTA for hosts, which relay to a fixed set of
 smart relays. It is designed to be simple to configure and especially
 useful on slave machines and in chroots.
 .
 The sendmail interface of this package doesn't provide the -bs switch,
 hence it's not LSB compatible!