diff --git a/disposable_email_blocklist.conf b/disposable_email_blocklist.conf
index 3b97dae..5d09c71 100644
--- a/disposable_email_blocklist.conf
+++ b/disposable_email_blocklist.conf
@@ -647,6 +647,7 @@ ctmailing.us
 ctos.ch
 cu.cc
 cubiclink.com
+cupbest.com
 cuirushi.org
 cuoly.com
 curlhph.tk