Sun Java Communications Suite 5 Deployment Planning Guide

Domain Name System (DNS)

Servers which make heavy usage of DNS queries should be equipped with a local caching DNS server to reduce lookup latency as well as network traffic.

When determining your requirements, consider allocating host names for functions such as mailstore, mail-relay-in, mail-relay-out, and so forth. You should consider this policy even if the host names all are currently hosted on one machine. With services configured in such a way, relocation of the services to alternate hardware significantly reduces the impacts of the change.