diff --git a/group_vars/postfix/plain.yml b/group_vars/postfix/plain.yml
index 2310fcc..6d0eaeb 100644
--- a/group_vars/postfix/plain.yml
+++ b/group_vars/postfix/plain.yml
@@ -18,3 +18,5 @@ postfix_smtpd_recipient_restrictions:
   - permit_mynetworks
   - permit_sasl_authenticated
   - reject_unauth_destination
+
+postfix_message_size_limit: 25600000