diff --git a/whitelist.conf b/whitelist.conf
index 3f3a230..2f12971 100644
--- a/whitelist.conf
+++ b/whitelist.conf
@@ -136,6 +136,7 @@ sent.as
 sent.at
 sent.com
 shitposting.agency
+sibmail.com
 spamcannon.com
 spamcannon.net
 spamgourmet.com