Fix DKIM information leakage

[exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 0598eccc8fb093a2c528ad8768ca4876958dd6b8..5324be398358c333fe7506e5ba1cb80d634ce856 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -38273,6 +38273,7 @@ These options take (expandable) strings as arguments.
 MANDATORY:
 The domain you want to sign with. The result of this expanded
 option is put into the &%$dkim_domain%& expansion variable.
+If it is empty after expansion, DKIM signing is not done.
 
 .option dkim_selector smtp string&!! unset
 MANDATORY: