$h
Host part of the delivery agent triple All versions
The parse rule set
0 (The parse Rule Set 0 on page
696) is used to resolve the recipient address into a
triple: the delivery agent (with $#), the host part of
the address (with $@), and the recipient address (with
$:). The host
part, from the $@, is made the value of $h. Once $h’s value has been set,
it undergoes no further rule-set parsing.
$h is intended for
use in the A=
equate (A= on page 738) of
delivery agent definitions. Normally, it is
converted to all lowercase before use, but that
conversion can be suppressed with the F=h delivery agent flag
(F=h on page 772).
$h is also used by
the localaddr
rule set 5 (The localaddr Rule Set 5 on page 700) to process
+detail addresses (Plussed Detail Addressing on page
476).
$h is transient. If
it is defined in the configuration file or in the
command line, that definition can be ignored by
sendmail. Note that a
$& prefix
is necessary when you reference this macro in rules
(that is, use $&h, not $h).
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