+#define PDKIM_DEFAULT_SIGN_HEADERS "From:Sender:Reply-To:Subject:Date:"\
+ "Message-ID:To:Cc:MIME-Version:Content-Type:"\
+ "Content-Transfer-Encoding:Content-ID:"\
+ "Content-Description:Resent-Date:Resent-From:"\
+ "Resent-Sender:Resent-To:Resent-Cc:"\
+ "Resent-Message-ID:In-Reply-To:References:"\
+ "List-Id:List-Help:List-Unsubscribe:"\
+ "List-Subscribe:List-Post:List-Owner:List-Archive"
+
+#define PDKIM_OVERSIGN_HEADERS "+From:+Sender:+Reply-To:+Subject:+Date:"\
+ "+Message-ID:+To:+Cc:+MIME-Version:+Content-Type:"\
+ "+Content-Transfer-Encoding:+Content-ID:"\
+ "+Content-Description:+Resent-Date:+Resent-From:"\
+ "+Resent-Sender:+Resent-To:+Resent-Cc:"\
+ "+Resent-Message-ID:+In-Reply-To:+References:"\
+ "+List-Id:+List-Help:+List-Unsubscribe:"\
+ "+List-Subscribe:+List-Post:+List-Owner:+List-Archive"
+