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-rw-r--r--doc/doc-txt/experimental-spec.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index 301152f1a..328d0940a 100644
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -941,6 +941,9 @@ change.
NOTE: since the EHLO command must be constructed before the connection is
made it cannot depend on the interface IP address that will be used.
+The string "$sending_ip_address" is checked for; if it appears in helo_data
+and "def:sending_ip_address" does not, the facility is disabled.
+
Transport configurations should be checked for this. An example avoidance:
helo_data = ${if def:sending_ip_address \