diff --git a/opendkim.conf b/opendkim.conf
index 90fb3ea..c94fee0 100644
--- a/opendkim.conf
+++ b/opendkim.conf
@@ -19,3 +19,6 @@ SignatureAlgorithm      rsa-sha256
 
 UserID                  opendkim:opendkim
 Socket                  inet:8891@localhost
+
+SignHeaders             From,Sender,To,CC,Subject,Message-Id,Date,MIME-Version,Content-Type,Reply-To
+OversignHeaders         From,Sender,To,CC,Subject,Message-Id,Date,MIME-Version,Content-Type,Reply-To