diff --git a/Sources/Subs-Post.php b/Sources/Subs-Post.php
index 496c32ebb2..1e964c2705 100644
--- a/Sources/Subs-Post.php
+++ b/Sources/Subs-Post.php
@@ -1599,8 +1599,9 @@ function server_parse($message, $socket, $code, &$response = null)
 		/*
 		 * 550 - cPanel rejected sending due to DNS issues
 		 * 450 - DNS Routing issues
+		 * 451 - cPanel "Temporary local problem - please try later"
 		 */
-		if ($response_code < 500 && $response_code != 450)
+		if ($response_code < 500 && !in_array($response_code, array(450, 451)))
 			log_error($txt['smtp_error'] . $server_response);
 
 		return false;