diff --git a/roles/shell/files/etc/postfix/main.cf b/roles/shell/files/etc/postfix/main.cf
index cfd1fc3..6ab6c99 100644
--- a/roles/shell/files/etc/postfix/main.cf
+++ b/roles/shell/files/etc/postfix/main.cf
@@ -78,6 +78,7 @@ smtpd_recipient_restrictions =
  reject_rbl_client pbl.spamhaus.org,
  reject_rbl_client blackholes.tepucom.nl,
  reject_rbl_client hostkarma.junkemailfilter.com=127.0.0.2,
+ reject_rbl_client truncate.gbudb.net,
  reject_rhsbl_sender dbl.spamhaus.org
 
 policyd-spf_time_limit = 3600