ARC: on the smtp transport option take empty or forced-fail to disable signing

[users/jgh/exim.git] / doc / doc-txt / experimental-spec.txt

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index 839200c6cd0923d63bfbb92bfd55431ea21b6a2b..3389632a2eeac6b82a990a33a36924c6b213693c 100644 (file)
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -802,6 +802,7 @@ arc_sign = <admd-identifier> : <selector> : <privkey>
 An option on the smtp transport, which constructs and prepends to the message
 an ARC set of headers.  The textually-first Authentication-Results: header
 is used as a basis (you must have added one on entry to the ADMD).
+Expanded; if unset, empty or forced-failure then no signing is done.