diff --git a/lib/domains/stoplist.txt b/lib/domains/stoplist.txt
index fb3b3a346d..af4c054619 100644
--- a/lib/domains/stoplist.txt
+++ b/lib/domains/stoplist.txt
@@ -233,6 +233,7 @@ mail.ntust.edu.tw
 mails.qust.edu.cn
 lzjtu.edu.cn
 connect.hku.hk
+graduate.hku.hk
 stu.scu.edu.cn
 kust.edu.cn
 student.laccd.edu