From 1c5fc6f73ee6f0a9a157fcace21b69ad04b3bc8f Mon Sep 17 00:00:00 2001
From: niftylettuce <niftylettuce@gmail.com>
Date: Wed, 12 Aug 2020 19:49:16 -0500
Subject: [PATCH] fix: catch edge case and bubble up detailed error rejection
 for tracing core issue

---
 index.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/index.js b/index.js
index 96ebda4..fd4c0b1 100644
--- a/index.js
+++ b/index.js
@@ -63,6 +63,17 @@ function authenticateMessage(message, ...args) {
       const result = {
         header: stdout.join('').trim().split('Authentication-Results: ')[1]
       };
+
+      // TODO: investigate thie edge case further and follow up with authheaders/dkimpy authors
+      if (!result.header)
+        return reject(
+          new Error(
+            `No Authentication-Results header was returned.  Data: ${JSON.stringify(
+              { message, stdout, stderr }
+            )}`
+          )
+        );
+
       for (const key of KEYS) {
         result[key] = {};
       }