Index: conf/main.cf
===================================================================
--- conf/main.cf.orig
+++ conf/main.cf
@@ -576,6 +576,7 @@ unknown_local_recipient_reject_code = 55
 #
 #smtpd_banner = $myhostname ESMTP $mail_name
 #smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
+smtpd_banner = $myhostname ESMTP
 
 # PARALLEL DELIVERY TO THE SAME DESTINATION
 #
@@ -682,4 +683,165 @@ sample_directory =
 # readme_directory: The location of the Postfix README files.
 #
 readme_directory =
+
+############################################################
+#
+# before changing values manually consider editing
+#  /etc/sysconfig/postfix
+# and run
+#  config.postfix
+#
+# if you miss a feature of config.postfix then just send a
+# mail to chris@computersalat.de
+# patches for new feature(s) are also welcome :)
+#
+############################################################
+
+biff = no
+content_filter = 
+delay_warning_time = 0h
+disable_dns_lookups = no
+disable_mime_output_conversion = no
+disable_vrfy_command = yes
+inet_interfaces = all
 inet_protocols = ipv4
+masquerade_classes = envelope_sender, header_sender, header_recipient
+masquerade_domains = 
+masquerade_exceptions = 
+mydestination = $myhostname, localhost.$mydomain, localhost
+myhostname = 
+mynetworks_style = subnet
+relayhost = 
+
+alias_maps = 
+canonical_maps = 
+relocated_maps = 
+sender_canonical_maps = 
+transport_maps = 
+mail_spool_directory = /var/mail 
+message_strip_characters = 
+defer_transports = 
+mailbox_command = 
+mailbox_transport = 
+mailbox_size_limit = 0
+message_size_limit = 0
+strict_8bitmime = no
+strict_rfc821_envelopes = no
+smtpd_delay_reject = yes
+smtpd_helo_required = no
+
+smtpd_client_restrictions = 
+
+smtpd_helo_restrictions = 
+
+smtpd_sender_restrictions = 
+
+smtpd_recipient_restrictions = 
+
+
+######################################################################
+# SMTP Smuggling (CVE-2023-51764)
+# no: allows SMTP smuggling
+# yes / normalize : 
+#   but allow local clients with non-standard SMTP implementations
+#   such as netcat, fax machines, or load balancer health checks.
+# reject: 
+#   rejects a command or message that contains a bare newline
+######################################################################
+smtpd_forbid_bare_newline = normalize
+smtpd_forbid_bare_newline_exclusions = $mynetworks
+#smtpd_forbid_bare_newline_reject_code = 521
+
+############################################################
+# SASL stuff
+############################################################
+smtp_sasl_auth_enable = no
+smtp_sasl_security_options = 
+smtp_sasl_password_maps = 
+smtpd_sasl_auth_enable = no
+# cyrus   : smtpd_sasl_type = cyrus
+#           smtpd_sasl_path = smtpd
+# dovecot : smtpd_sasl_type = dovecot
+#           smtpd_sasl_path = private/auth
+smtpd_sasl_type = cyrus
+smtpd_sasl_path = smtpd
+############################################################
+# TLS stuff
+############################################################
+#tls_append_default_CA = no
+relay_clientcerts = 
+#tls_random_source = dev:/dev/urandom
+
+smtp_use_tls = no
+#smtp_tls_loglevel = 0
+smtp_enforce_tls = no
+smtp_tls_security_level = 
+smtp_tls_CAfile = 
+smtp_tls_CApath = 
+smtp_tls_cert_file = 
+smtp_tls_key_file = 
+#smtp_tls_policy_maps = hash:/etc/postfix/tls_policy
+#smtp_tls_session_cache_timeout = 3600s
+smtp_tls_session_cache_database = 
+
+smtpd_use_tls = no
+#smtpd_tls_loglevel = 0
+smtpd_enforce_tls = no
+smtpd_tls_security_level = 
+smtpd_tls_CAfile = 
+smtpd_tls_CApath = 
+smtpd_tls_cert_file = 
+smtpd_tls_key_file = 
+smtpd_tls_ask_ccert = no
+smtpd_tls_exclude_ciphers = RC4
+smtpd_tls_received_header = no
+############################################################
+# OpenDKIM
+############################################################
+#smtpd_milters = unix:/run/opendkim/opendkim.sock
+#non_smtpd_milters = $smtpd_milters
+#milter_default_action = accept
+#milter_protocol = 2
+############################################################
+# Start MySQL from postfixwiki.org
+############################################################
+relay_domains = $mydestination, hash:/etc/postfix/relay
+#relay_recipient_maps = hash:/etc/postfix/relay_recipients
+#virtual_alias_domains = 
+#virtual_alias_maps = hash:/etc/postfix/virtual
+#virtual_uid_maps = static:303
+#virtual_gid_maps = static:303
+#virtual_minimum_uid = 303
+#virtual_mailbox_base = /srv/maildirs
+#virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
+#virtual_mailbox_limit = 0
+#virtual_mailbox_limit_inbox = no
+#virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
+## For dovecot LMTP replace 'virtual' with 'lmtp:unix:private/dovecot-lmtp'
+#virtual_transport = virtual
+## Additional for quota support
+#virtual_mailbox_limit_maps = mysql:/etc/postfix/mysql_virtual_mailbox_limit_maps.cf
+#virtual_mailbox_limit_override = yes
+### Needs Maildir++ compatible IMAP servers, like Courier-IMAP
+#virtual_maildir_filter = yes
+#virtual_maildir_filter_maps = hash:/etc/postfix/vfilter
+#virtual_maildir_limit_message = Sorry, the user's maildir has overdrawn his diskspace quota, please try again later.
+#virtual_maildir_limit_message_maps = hash:/etc/postfix/vmsg
+#virtual_overquota_bounce = yes
+#virtual_trash_count = yes
+#virtual_trash_name = ".Trash"
+############################################################
+# End MySQL from postfixwiki.org
+############################################################
+# Rewrite reject codes
+############################################################
+#unknown_address_reject_code = 550
+#unknown_client_reject_code = 550
+#unknown_hostname_reject_code = 550
+#unverified_recipient_reject_code = 550
+#unverified_sender_reject_code = 550
+#soft_bounce = yes
+############################################################
+#debug_peer_list = example.com
+#debug_peer_level = 3
+