diff --git a/roles/mail_server/defaults/main.yml b/roles/mail_server/defaults/main.yml
index cb0eacf4ae162afdad64467c802383994e6ec3da..06eef0d80344e5ec3f2bbbf5a6b9f1648d473757 100644
--- a/roles/mail_server/defaults/main.yml
+++ b/roles/mail_server/defaults/main.yml
@@ -18,3 +18,4 @@ mail_server_tls_protocols:
 mail_server_tls_ciphers: "DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-GCM-SHA384:\
 DHE-RSA-AES256-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-GCM-SHA384:\
 ECDHE-RSA-AES256-SHA384:!aNULL:!MD5:!EXPORT"
+mail_message_size_limit: 10240000