diff --git a/roles/mailman/files/mailman.cfg b/roles/mailman/files/mailman.cfg
index d6024fe..0de4846 100644
--- a/roles/mailman/files/mailman.cfg
+++ b/roles/mailman/files/mailman.cfg
@@ -60,6 +60,7 @@ admin_pass: 2BeMu4kyHzMA8K95IvoevuU1G1dO9ovZn2TLvu5045PGiVUe
 [mta]
 incoming: mailman.mta.postfix.LMTP
 outgoing: mailman.mta.deliver.deliver
+remove_dkim_headers: yes
 smtp_host: localhost
 smtp_port: 25
 smtp_user: