diff --git a/roles/mail/files/sender_blacklist b/roles/mail/files/sender_blacklist
index 351d2de..ebee955 100644
--- a/roles/mail/files/sender_blacklist
+++ b/roles/mail/files/sender_blacklist
@@ -9,5 +9,6 @@ cleverep.com       REJECT
 allsip.ru          REJECT
 clickup.com        REJECT
 secureserver.net   REJECT
+pillenstein.de     REJECT
 sina.buffy@avantgarde-experts.de OK
 .avantgarde-experts.de OK