diff --git a/lib/domains/blacklist.txt b/lib/domains/blacklist.txt
index 623d16f5f3..1e4aec0ac5 100644
--- a/lib/domains/blacklist.txt
+++ b/lib/domains/blacklist.txt
@@ -42,3 +42,7 @@ hndx.ac.cn
 nkdx.ac.cn
 northfacing.ac.cn
 lxiv.secondary.edu.pl
+mail.mzr.me 
+mail.hrka.net 
+abcda.tech
+t.odmail.cn