You must also have DKIM present (not disabled), and you very likely
want to have SPF enabled.
+It is possible to build as a dynamic-load module: set also SUPPORT_ARC=2.
+
Verification
--
$proxy_external_address, $proxy_external_port have the proxy "outside" values
$sender_host_address, $sender_host_port have the remot client values
+
+
+
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