"Clusters of servers running Sendmail can deliver high
performance and high availability at competitive prices. For
experienced systems administrators, this has long been a commonly
held practice. This article describes a study that quantifies and
describe ways to achieve highly available/scalable sendmail.
The study uses several configurations of Sendmail clusters on
Linux and quantifies their relative performance. It investigates
and test common performance tuning parameters in Sendmail's
configuration and in the Linux operating system.