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## Writing the Configuration Files

The configuration for the Brewery works as follows: all hosts except the mail server vstout itself route all outgoing mail to the server, using smart host routing. vstout itself sends all outgoing mail to the real smart host that routes all of the Brewery's mail; this host is called moria.

The standard config file for all hosts other than vstout looks like this:

               #
               # Our domain:
               visible domain=vbrew.com
               #
               # What we name ourselves
               visible name=vbrew.com
               #
               # Smart-host routing: via SMTP to vstout
               smart path=vstout
               smart transport=smtp

This is very similar to what we used for a UUCP-only site. The main difference is that the transport used to send mail to the smart host is, of course, SMTP. The visible_domain attribute makes smail use the domain name instead of the local hostname on all outgoing mail.

On the UUCP mail gateway vstout, the config file looks a little different:

               # Our hostnames:
               hostnames=vbrew.com:vstout.vbrew.com:vstout
               #
               # What we name ourselves
               visible name=vbrew.com
               #
               # in the uucp world, we're known as vbrew.com
               uucp name=vbrew.com
               #
               # Smart transport: via uucp to moria
               smart path=moria
               smart transport=uux
               #
               # we're authoritative for our domain
               auth domains=vbrew.com

This config file uses a different scheme to tell smail what the local host is called. Instead of giving it a list of domains and letting it find the hostname with a system call, it specifies a list explicitly. The above list contains both the fully qualified and the unqualified hostname, and the domain name all by itself. This makes smail recognize janet@vbrew.com as a local address, and deliver the message to janet.

The auth_domains variable names the domains for which vstout is considered to be authoritative. That is, if smail receives any mail addressed to host.vbrew.com where host does not name an existing local machine, it rejects the message and returns it to the sender. If this entry isn't present, any such message will be sent to the smart-host, who will return it to vstout, and so on until it is discarded for exceeding the maximum hop count.