??? Not all configuration files focus with user<@domain>. IDA, for example, uses a
more complex focus: <@domain,...,user>. Be sure you understand the style of
focusing that is used in your configuration file before attempting to create new
rules.??
??? Avoid confusing rule sets 1 and 2 when adding rules. Rule set 1 is for the sender;
rule set 2 is for the recipient.
??? Typos in rule set declarations can be difficult to locate. For example, S1O (in
which the last character is the capital letter O) will silently evaluate to rule set 1
when you really meant rule set 10.
19.9 Policy Rule Set Reference
Beginning withV8.8, sendmail calls special rule sets internally to determine its behavior.
Called the policy rule sets, they are used for such varied tasks as setting spam
handling, setting policy, or validating the conditions when ETRN should be allowed,
to list just a few. Table 19-2 shows the complete list of these policy rule sets. Note
that we merely summarize them here, and that some are described in detail in other
chapters. Those that we describe here are detailed in the following sections.
* This is a truly bogus example. We are really stretching to find a use for rule set 2. There is no reason to do
this debugging in rule set 2 because rule set 99 would work just as well. According to Eric, ???I can think of no
good reason to use S2 today.
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