FEATURE(relay_hosts_only)
Relay individual hosts, not domains V8.9 and later
Ordinarily, the names listed with RELAY_DOMAIN (those
allowed to relay through the local machine, The RELAY_DOMAIN mc macro
on page 269) are names of domains. By declaring this
FEATURE(relay_hosts_only), you cause
the names in that list to be interpreted as the
names of hosts, not domains. This feature, how it is
used, and how it fits into relaying and spam
handling are explained in FEATURE(relay_hosts_only) on page 273.
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