diff --git a/templates/main.cf.j2 b/templates/main.cf.j2
index 7959444..606af95 100644
--- a/templates/main.cf.j2
+++ b/templates/main.cf.j2
@@ -136,3 +136,7 @@ milter_default_action = accept
 
 smtpd_milters = {{ ' '.join(postfix.smtpd_milters) }}
 non_smtpd_milters = {{ ' '.join(postfix.non_smtpd_milters) }}
+
+# Disable all error reports to postmaster@, because they sometimes contain
+# passwords or other confidential information
+notify_classes =