The lefthand column is the
key which is composed of a prefix and an address expression. The prefix depends on
the rule set doing the lookup. For some it is Connect: or From:, and for others it is TLS_
Srv: or TLS_Clt:. These are described in the sections of this book dealing with the
appropriate rule set.
The address expression can be any of the following depending on what the rule set is
trying to do:
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7.5 The access Database | 279
host.your.domain ?†? a hostname
your.domain ?†? a domain name
user@ ?†? a username
user@host.another.domain ?†? a user address
123.45.67.89 ?†? an IPv4 host address
123.45 ?†? an IPv4 network (leftmost numbers)
IPv6:2002:c0a8:51d2::23f4 ?†? an IPv6 host address
IPv6:2002:c0a8:02c7 ?†? an IPv6 network (leftmost numbers)
Note that for usernames the @ is mandatory. More address expressions can be used
than we show here. These are the most common. Others are described under the rule
sets that use them.
The righthand column contains the value, which can be keywords or values that
determine what should be done with the item described on the left. They are shown
in Table 7-3, and are described in the sections indicated.
7.5.2.1 OK
The OK righthand value for the access database tells sendmail to accept the user,
host, domain, or address on the lefthand side.
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