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 | Chapter 11
Rule Sets 1 and S= |  |
All machines can be known by two names: the normal hostname
(as defined by $w) and the generic name localhost.
Design and test a rule for Hubset that tests for and rewrites
a sender address like you@localhost. When we speak of the sender, we have lumped together the envelope
and header senders into one. Try to think of examples in which the
sender header address should be rewritten in a way that is different
from the
sender envelope address. At a site that has more than one hub, it would be necessary to
route mail from some clients to one hub and mail from other
clients to another. Think of a basis for such a division (such as
subnets or NIS domains) and design a set of rules (in a single
configuration file) to
rewrite the sender address appropriately for a selected hub. Consider the need to match subsets of a subdomain. For example,
assume that the local hostname is here and the local
domain is my.sub.domain. At such a site, all of the following are
legal addresses: you@here, you@here.my, and
you@here.my.sub.domain.
But the following is illegal: you@here.my.sub.
Modify rule set Hubset in the client.cf file so that
it recognizes all the legal forms of addressing in a subdomain.
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