Fix off-by-one error in Message ID header count check in Util\Emailer

diff --git a/src/Util/Emailer.php b/src/Util/Emailer.php
index 1341aaf33e42b0de3fd933b3767a04ff4dac4564..d04569823366e5dbfa8b55b76691e640aeabc404 100644 (file)
--- a/src/Util/Emailer.php
+++ b/src/Util/Emailer.php
@@ -141,7 +141,7 @@ class Emailer
                                $countMessageId += count($value);
                        }
                }
-               if ($countMessageId > 0) {
+               if ($countMessageId > 1) {
                        $this->logger->warning('More than one Message-ID found - RFC violation', ['email' => $email]);
                }