diff --git a/support/docker/production/.env b/support/docker/production/.env
index 8ed9b062b..86356d5a3 100644
--- a/support/docker/production/.env
+++ b/support/docker/production/.env
@@ -38,6 +38,8 @@ POSTFIX_myhostname=<MY DOMAIN>
 # If you need to generate a list of sub/DOMAIN keys
 # pass them as a whitespace separated string <DOMAIN>=<selector>
 OPENDKIM_DOMAINS=<MY DOMAIN>=peertube
+# see https://github.com/wader/postfix-relay/pull/18
+OPENDKIM_RequireSafeKeys=no
 
 # Let's Encrypt service configuration
 TRAEFIK_ACME_EMAIL=<MY EMAIL ADDRESS>