diff --git a/lib/domains/stoplist.txt b/lib/domains/stoplist.txt
index 0920be3b1e..0b9853a6a3 100644
--- a/lib/domains/stoplist.txt
+++ b/lib/domains/stoplist.txt
@@ -227,4 +227,5 @@ wru.vn
 bcmail.cuny.edu
 peking.pkumail.tech
 stu.hcnu.edu.cn
-stu.ouc.edu.cn
\ No newline at end of file
+stu.ouc.edu.cn
+tsinghua.pkumail.tech
\ No newline at end of file