Merge branch 'MDL-67772-email-thread-headers-MOODLE_402_STABLE' of https://github.com/brendanheywood/moodle into MOODLE_402_STABLE

2024-02-05 13:33:57 +07:00
parent cea960eeb4 60c7936c6a
commit 8af2a58c33
1 changed files with 5 additions and 0 deletions
@@ -485,6 +485,11 @@ class send_user_notifications extends \core\task\adhoc_task {
            } else {
                $headers[] = "References: $parentid";
            }
+        } else {
+            // If the message IDs that Moodle creates are overwritten then referencing these
+            // IDs here will enable then to still thread correctly with the first email.
+            $headers[] = "In-Reply-To: $rootid";
+            $headers[] = "References: $rootid";
        }

        // MS Outlook / Office uses poorly documented and non standard headers, including