{% if postfix.postscreen | default(False) %}
# postscreen config
-postscreen_dnsbl_threshold = 2
+postscreen_dnsbl_threshold = 3
postscreen_dnsbl_whitelist_threshold = -2
postscreen_dnsbl_sites =
- ix.dnsbl.manitu.net*2 sbl-xbl.spamhaus.org*2 truncate.gbudb.net*2
+ ix.dnsbl.manitu.net*2 sbl-xbl.spamhaus.org*3 truncate.gbudb.net*2
bl.spamcop.net bl.mailspike.net
swl.spamhaus.org*-2 list.dnswl.org=127.0.[0..255].[0..254]*-2
postscreen_greet_action = enforce
reject_non_fqdn_recipient,
reject_non_fqdn_sender,
+# SMTP smuggling protection
+# <https://www.postfix.org/smtp-smuggling.html>
+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 }}