Sun Java System Messaging Server 6.3 Administration Guide

16.5.2 Configuring Relays for Sending Messages Via LMTP to Back End Systems with Message Stores and Full MTAs

There are situations where you might want the back end stores to have the full capabilities of the MTA but still to have the load savings of using LMTP. For example, you might want program delivery on the back end store. In this case the relays should be configured as described above in To Configure the Inbound MTA Relays with LMTP