Mail Transfer Agent

Most reasonable UNIX workstations run a daemon which listens to port 25 on the loopback address, and delivers whatever mail it receives there via SMTP. This daemon is known as a Mail Transfer Agent.

There are many available free MTAs. by default, ubuntu does not install or configure an MTA.

Configured Workstations should have a functional MTA, because having such a tool greatly eases maintenance.

It would be reasonable if these MTAs all were configured to speak directly to CAL's Mail Server as a so-called smarthost.

So the question is, what MTA should we run on the CWs? the Mail Server will most likely be running postfix, but exim4 (in particular, the exim4-daemon-light package) is very easy to configure to run with a smarthost.