Current File : //etc/postfix/main.cf

myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# Turning off the backwards-compatibility safety net
# http://www.postfix.org/COMPATIBILITY_README.html
compatibility_level = 2

# Appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# Max mail size in byte
message_size_limit = 36700160

# TLS parameters
smtpd_use_tls = yes
smtpd_tls_auth_only = yes

smtpd_tls_cert_file = /etc/ssl/keyhelp/mail.pem
smtpd_tls_key_file = /etc/ssl/keyhelp/mail.pem
smtpd_tls_CAfile = /etc/ssl/keyhelp/mail-ca.crt
smtp_tls_CApath = /etc/ssl/certs
smtpd_tls_CApath = /etc/ssl/certs

smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache

smtp_tls_mandatory_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1 
smtpd_tls_mandatory_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1 
smtp_tls_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1 
smtpd_tls_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1 

smtp_tls_security_level = may
smtpd_tls_security_level = may

# TLS cypher for PFS
smtp_tls_mandatory_ciphers = high
smtpd_tls_mandatory_ciphers = high

# medium for now, otherwise breakes with older SMTP
smtp_tls_ciphers = medium
smtpd_tls_ciphers = medium

smtpd_tls_dh512_param_file = /etc/postfix/dh512.pem
smtpd_tls_dh1024_param_file = /etc/postfix/dh2048.pem

smtpd_tls_exclude_ciphers = RC4, 3DES, aNULL
smtp_tls_exclude_ciphers = RC4, 3DES, aNULL
smtpd_tls_eecdh_grade = ultra
tls_eecdh_strong_curve = prime256v1
tls_eecdh_ultra_curve = secp384r1

tls_medium_cipherlist = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
tls_preempt_cipherlist = no

# Dovecot Settings for deliver, SASL Auth and virtual transport
# uncomment those line to use Dovecot
mailbox_command = /usr/lib/dovecot/deliver

#dovecot_destination_recipient_limit = 1
#transport_maps = hash:/etc/postfix/transport
mailbox_transport = dovecot

smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth

myhostname = server.kundensystem.cc
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = localhost, $myhostname
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
smtputf8_enable = yes

# Handing off local delivery to Dovecot's LMTP, and telling it where to store mail
virtual_transport = lmtp:unix:private/dovecot-lmtp
#virtual_transport = dovecot

# Virtual domains, users, and aliases
virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf




# Concerning the peer
smtpd_soft_error_limit = 5
smtpd_error_sleep_time = 10s

smtpd_helo_required = yes

smtpd_client_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_multi_recipient_bounce,
    reject_unauth_destination

smtpd_helo_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    # check_helo_access regexp:/etc/postfix/helo_access,
    reject_invalid_hostname,
    reject_non_fqdn_hostname

# Concerning the envelope
smtpd_sender_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_non_fqdn_sender,
    reject_unauth_destination,
    reject_unknown_sender_domain,
    reject_unknown_client,
    reject_non_fqdn_hostname

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unauth_pipelining, reject_non_fqdn_recipient, reject_rbl_client bl.spamcop.net

smtpd_recipient_limit = 50
smtpd_recipient_overshoot_limit = 50

# Header checks
header_checks = regexp:/etc/postfix/header_checks

# Rspamd
milter_protocol = 6
milter_default_action = accept
smtpd_milters = inet:localhost:11332
non_smtpd_milters = inet:localhost:11332

# SNI support
tls_server_sni_maps = hash:/etc/postfix/postfix-sni.conf
smtpd_forbid_bare_newline = yes
smtpd_forbid_bare_newline_exclusions = $mynetworks