diff --git a/sources/hooks/conf_regen/98-postfix_mailman b/sources/hooks/conf_regen/98-postfix_mailman
new file mode 100644
index 0000000..5eff47d
--- /dev/null
+++ b/sources/hooks/conf_regen/98-postfix_mailman
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -e
+
+do_pre_regen() {
+	pending_dir=$1
+
+	# Patch postfix conf
+	postfix_main_cf="${pending_dir}/../postfix/etc/postfix/main.cf"
+
+	# FIXME : check this file actually exists to not crash when only running this
+	# hook alone
+	
+	cat << EOT >> $postfix_main_cf
+unknown_local_recipient_reject_code = 550
+owner_request_special = no
+
+transport_maps =
+    hash:/var/lib/mailman3/data/postfix_lmtp
+local_recipient_maps =
+    hash:/var/lib/mailman3/data/postfix_lmtp
+relay_domains =
+    hash:/var/lib/mailman3/data/postfix_domains
+EOT
+}
+
+do_post_regen() {
+
+	regen_conf_files=$1
+	
+}
+
+FORCE=${2:-0}
+DRY_RUN=${3:-0}
+
+case "$1" in
+	pre)
+		do_pre_regen $4
+		;;
+	post)
+		do_post_regen $4
+		;;
+	*)
+		echo "hook called with unknown argument \`$1'" >&2
+		exit 1
+		;;
+esac
+
+exit 0
+
+
+
+