Add a comment in jenkins-dsl/cassandra_email_presend.groovy around expected setup behaviour
diff --git a/jenkins-dsl/cassandra_email_presend.groovy b/jenkins-dsl/cassandra_email_presend.groovy
index ab6a51d..ffd8f8e 100644
--- a/jenkins-dsl/cassandra_email_presend.groovy
+++ b/jenkins-dsl/cassandra_email_presend.groovy
@@ -1,2 +1,4 @@
+// This will fail first two times in Jenkins, first the script and then the removeHeader method needs to be approved.
+// Navigate to jenkins > Manage jenkins > In-process Script Approval
msg.removeHeader("In-Reply-To")
msg.removeHeader("References")
