# 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

inet_protocols = ipv6

smtpd_banner = $myhostname ESMTP $mail_name
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 parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

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

myhostname = localhost
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = /etc/mailname, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::1]/128 [2a01:4f8:121:50d2::2]/128
mailbox_size_limit = 0
recipient_delimiter = +

# SMTP configuration for incoming mail (port 25)
# Outgoing mail (port 587) configuration  is specified in master.cf

# allow all connections (since we want to receive mail from outside)
smtpd_client_restrictions = permit

# Don't talk to mail systems that don't know their own hostname.
# With Postfix < 2.3, specify reject_unknown_hostname.
smtpd_helo_restrictions = permit

# Don't accept mail from domains that don't exist.
smtpd_sender_restrictions = permit

# Only accept mail where this server is the final destination
smtpd_relay_restrictions = permit_auth_destination, permit_mynetworks, reject

# Mail thats not for us gets filtered out by smtpd_relay_restrictions
# When the mail is for us, we just accept everything. (could add spam blocklists/user checking etc. here)
smtpd_recipient_restrictions = permit

# Delivery to dovecot
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
virtual_alias_maps = hash:/etc/postfix/virtual
virtual_mailbox_domains = /etc/postfix/virtual-mailbox-domains
virtual_mailbox_maps = hash:/etc/postfix/virtual-mailbox-maps
virtual_transport = dovecot
dovecot_destination_recipient_limit = 1

# additional authentication settings
smtpd_tls_auth_only = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth