aliases??)
Configuring options withth e m4 technique is described in ?§24.4 on page 953 (with
the individual m4 option names listed in Table 24-3 on page 953). Options are
described in general in Chapter 24 on page 947. We recommend that you leap ahead
to that chapter, learn about options that will make your use of sendmail more valuable,
and then return here.
17.3.2 Define sendmail Macros
Defined sendmail macros can be declared in your mc file. Those that are useful are
listed in Table 21-5 on page 796. That section also describes the general technique of
defining sendmail macros via m4. To illustrate, for example:
define(`BITNET_RELAY??, `host.domain??)
causes the value host.domain to be assigned to an internal sendmail macro (currently
$B). Non-m4-specific defined macros can be declared withth e LOCAL_CONFIG
technique (?§17.3.3.1 on page 595).
17.3.3 Rules and Rule Sets
Rules are used to rewrite mail addresses and to select delivery agents, among other
things. They are organized in rule sets, which can be thought of as subroutines. We
deal with rules and rule sets more deeply in Chapter 18 on page 648 and Chapter 19
on page 683. Here we only illustrate how the mc configuration method is used to
insert custom rules and rule sets in a variety of convenient ways. We list all the mc
keywords that affect rules and rule sets in Table 17-2.
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