diff --git a/not_cloudflare/list_customerror.txt b/not_cloudflare/list_customerror.txt
index ff3287b64..5bf886f30 100644
--- a/not_cloudflare/list_customerror.txt
+++ b/not_cloudflare/list_customerror.txt
@@ -58,6 +58,7 @@ croplife.ca
 davidmburke.com
 dcleak.com
 delivery.acm.org
+delta.com
 demorgen.be
 digicert.com
 digitalenvelopes.email