Sun Java Communications Suite 5 Deployment Planning Guide

Implementing Local Message Transfer Protocol (LMTP) for Messaging Server

Best practices say you should implement LMTP to replace SMTP for message insertion. An LMTP architecture is more efficient for delivering to the back-end Message Store because it:

You need a two-tiered architecture to implement LMTP. See To Configure LMTP Delivery in Sun Java System Messaging Server 6.3 Administration Guide for instructions on configuring LMTP.

Note –

By design, LMTP is intended for use in multi-tier deployments. It is not possible to use LMTP with single-system deployments. Also, the Messaging Server's LMTP service as implemented is not designed to work with other LMTP servers or other LMTP clients.