bundlewrap/bundles/postfix/files/main.cf

smtpd_banner = SMTPd ready
biff = no
append_dot_mydomain = no
readme_directory = no
compatibility_level = 2
myhostname = ${node.metadata.get('postfix/myhostname')}
myorigin = /etc/mailname
mydestination = $myhostname, localhost
mynetworks = ${' '.join(sorted(mynetworks))}
mailbox_size_limit = 0
recipient_delimiter = +
inet_protocols = all
message_size_limit = ${node.metadata.get('postfix/message_size_limit_mb', 10)*1024*1024}
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases

% if 'relayhost' in node.metadata.get('postfix', {}):
relayhost = ${node.metadata['postfix']['relayhost']}
% endif

% if node.has_bundle('postfixadmin') or node.has_bundle('nftables'):
inet_interfaces = all
% else:
inet_interfaces = 127.0.0.1
% endif

<%text>
smtp_tls_loglevel = 1
smtp_tls_note_starttls_offer = yes
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_tls_security_level = dane
smtp_dns_support_level = dnssec
smtp_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtp_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtp_tls_ciphers = medium
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
</%text>

% if node.has_bundle('postfixadmin'):
smtpd_tls_cert_file = /var/lib/dehydrated/certs/${node.metadata.get('postfix/myhostname')}/fullchain.pem
smtpd_tls_key_file = /var/lib/dehydrated/certs/${node.metadata.get('postfix/myhostname')}/privkey.pem
<%text>
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_relay_restrictions = reject_non_fqdn_recipient reject_unknown_recipient_domain permit_mynetworks reject_unauth_destination
smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks reject_invalid_helo_hostname
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/blocked_recipients, permit_mynetworks
smtpd_relay_before_recipient_restrictions = yes

# https://ssl-config.mozilla.org/#server=postfix&version=3.7.10&config=intermediate&openssl=3.0.11&guideline=5.7
smtpd_tls_security_level = may
smtpd_tls_auth_only = yes
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_dh1024_param_file = /etc/ssl/certs/dhparam.pem
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:DHE-RSA-CHACHA20-POLY1305
tls_preempt_cipherlist = no
</%text>

relay_domains = $mydestination, pgsql:/etc/postfix/pgsql/relay_domains.cf
virtual_alias_maps = pgsql:/etc/postfix/pgsql/virtual_alias_maps.cf
virtual_mailbox_domains = pgsql:/etc/postfix/pgsql/virtual_domains_maps.cf
virtual_mailbox_maps = pgsql:/etc/postfix/pgsql/virtual_mailbox_maps.cf
virtual_mailbox_base = /var/mail/vmail
virtual_mailbox_limit = 0
virtual_minimum_uid = 115
virtual_uid_maps = static:115
virtual_gid_maps = static:115
local_transport = virtual
local_recipient_maps = $virtual_mailbox_maps
% if node.has_bundle('dovecot'):
virtual_transport = lmtp:unix:private/dovecot-lmtp

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_authenticated_header = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
% endif

% if node.has_bundle('rspamd'):
smtpd_milters = inet:localhost:11332
non_smtpd_milters = inet:localhost:11332
milter_protocol = 6
milter_mail_macros =  i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_default_action = accept
% endif

mua_relay_restrictions = reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_mynetworks,permit_sasl_authenticated,reject
mua_sender_restrictions = permit_mynetworks,reject_non_fqdn_sender,permit_sasl_authenticated,reject
mua_client_restrictions = permit_mynetworks,permit_sasl_authenticated,reject
% endif