diff --git a/lib/domains/blacklist.txt b/lib/domains/blacklist.txt
index 1e4aec0ac5..ba4633ff07 100644
--- a/lib/domains/blacklist.txt
+++ b/lib/domains/blacklist.txt
@@ -46,3 +46,4 @@ mail.mzr.me
 mail.hrka.net 
 abcda.tech
 t.odmail.cn
+ccc.edu
\ No newline at end of file