yunohost/data/templates/postfix/main.cf

# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname Service ready
biff = no

# 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

# -- TLS for incoming connections
# By default, TLS is disabled in the Postfix SMTP server, so no difference to
# plain Postfix is visible. Explicitly switch it on with "smtpd_tls_security_level = may".
smtpd_tls_security_level=may

# Sending AUTH data over an unencrypted channel poses a security risk.
# When TLS layer encryption is optional ("smtpd_tls_security_level = may"), it
# may however still be useful to only offer AUTH when TLS is active. To maintain
# compatibility with non-TLS clients, the default is to accept AUTH without
# encryption. In order to change this behavior, we set "smtpd_tls_auth_only = yes".
smtpd_tls_auth_only=yes
smtpd_tls_cert_file = /etc/yunohost/certs/{{ main_domain }}/crt.pem
smtpd_tls_key_file = /etc/yunohost/certs/{{ main_domain }}/key.pem
smtpd_tls_exclude_ciphers = aNULL, MD5, DES, ADH, RC4, 3DES
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_tls_loglevel=1
{% if compatibility == "intermediate" %}
smtpd_tls_mandatory_protocols=!SSLv2,!SSLv3
{% else %}
smtpd_tls_mandatory_protocols=!SSLv2,!SSLv3,!TLSv1,!TLSv1.1
{% endif %}
smtpd_tls_mandatory_ciphers=high
smtpd_tls_eecdh_grade = ultra

# -- TLS for outgoing connections
# Use TLS if this is supported by the remote SMTP server, otherwise use plaintext.
smtp_tls_security_level=may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_tls_exclude_ciphers = $smtpd_tls_exclude_ciphers
smtp_tls_mandatory_ciphers= $smtpd_tls_mandatory_ciphers
smtp_tls_loglevel=1

# Configure Root CA certificates
# (for example, avoids getting "Untrusted TLS connection established to" messages in logs)
smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = {{ main_domain }}
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydomain = {{ main_domain }}
mydestination = localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all

#### Fit to the maximum message size to 30mb, more than allowed by GMail or Yahoo ####
message_size_limit = 31457280

# Virtual Domains Control
virtual_mailbox_domains = ldap:/etc/postfix/ldap-domains.cf
virtual_mailbox_maps = ldap:/etc/postfix/ldap-accounts.cf
virtual_mailbox_base =
virtual_alias_maps = ldap:/etc/postfix/ldap-aliases.cf
virtual_alias_domains =
virtual_minimum_uid = 100
virtual_uid_maps = static:vmail
virtual_gid_maps = static:mail
smtpd_sender_login_maps= ldap:/etc/postfix/ldap-accounts.cf

# Dovecot LDA
virtual_transport = dovecot
dovecot_destination_recipient_limit = 1

# Enable SASL authentication for the smtpd daemon
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
# Fix some outlook's bugs
broken_sasl_auth_clients = yes
# Reject anonymous connections
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =


# Wait until the RCPT TO command before evaluating restrictions
smtpd_delay_reject = yes

# Basics Restrictions
smtpd_helo_required = yes
strict_rfc821_envelopes = yes

# Requirements for the connecting server
smtpd_client_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_rbl_client bl.spamcop.net,
    reject_rbl_client cbl.abuseat.org,
    reject_rbl_client zen.spamhaus.org,
    permit

# Requirements for the HELO statement
smtpd_helo_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_non_fqdn_hostname,
    reject_invalid_hostname,
    permit

# Requirements for the sender address
smtpd_sender_restrictions =
    reject_sender_login_mismatch,
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_non_fqdn_sender,
    reject_unknown_sender_domain,
    permit

# Requirement for the recipient address
smtpd_recipient_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_non_fqdn_recipient,
    reject_unknown_recipient_domain,
    reject_unauth_destination,
    permit

# SRS
sender_canonical_maps = tcp:localhost:10001
sender_canonical_classes = envelope_sender
recipient_canonical_maps = tcp:localhost:10002
recipient_canonical_classes= envelope_recipient,header_recipient

# Ignore some headers
smtp_header_checks = regexp:/etc/postfix/header_checks

smtp_reply_filter = pcre:/etc/postfix/smtp_reply_filter

# Rmilter
milter_mail_macros =  i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_protocol = 6
smtpd_milters = inet:localhost:11332

# Skip email without checking if milter has died
milter_default_action = accept

# Avoid to send simultaneously too many emails
smtp_destination_concurrency_limit = 1
default_destination_rate_delay = 5s

# Avoid email adress scanning
# By default it's possible to detect if the email adress exist
# So it's easly possible to scan a server to know which email adress is valid
# and after to send spam
disable_vrfy_command = yes