FEATURE(use_client_ptr)—V8.13 and Later
The check_relay
rule set (Local_check_relay and check_relay on page 252) is used to screen incoming network
connections and accept or reject them based on the
hostname, domain, or IP address. The check_relay rule set is
called with a workspace that looks like this:
host $| IPaddress
The host name and
IP address are separated by the $| operator. As of
V8.13, this FEATURE(use_client_ptr) causes a new
rule to be inserted as the first rule under the
check_relay
rule set, which substitutes the value of the
${client_ptr}
macro (${client_ptr} on page 813) for the prior host value
passed.
Essentially, this causes V8.13 sendmail to behave like
earlier versions of sendmail that did not use the delay_checks.
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