From 1a81a89d4ee46867ea405ac09fc55309a0337c82 Mon Sep 17 00:00:00 2001 From: Ralf Jung Date: Tue, 26 Dec 2023 10:08:29 +0100 Subject: [PATCH 1/1] prevent SMTP smuggling --- roles/email/templates/main.cf | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/roles/email/templates/main.cf b/roles/email/templates/main.cf index 45c77d3..2d254f0 100644 --- a/roles/email/templates/main.cf +++ b/roles/email/templates/main.cf @@ -65,6 +65,11 @@ smtpd_recipient_restrictions = permit_mynetworks, permit_tls_clientcerts, reject_non_fqdn_recipient, reject_non_fqdn_sender, +# SMTP smuggling protection +# +smtpd_data_restrictions = reject_unauth_pipelining +smtpd_discard_ehlo_keywords = chunking + {% if postfix.relay_host is defined %} # Relay everything default_transport = smtp:{{ postfix.relay_host }} -- 2.30.2