start_script.sh

#!/bin/bash

echo "policy-spf  unix  -       n       n       -       -       spawn" >> /etc/postfix/master.cf
echo "     user=nobody argv=/usr/bin/policyd-spf" >> /etc/postfix/master.cf

echo "myhostname = ${HOSTNAME}.home" >> /etc/postfix/main.cf
if [ ! -z "${POSTFIX_MAILNAME}" ]; then
    echo "${POSTFIX_MAILNAME}" > /etc/mailname
    echo "myorigin = /etc/mailname" >> /etc/postfix/main.cf
    if [ "${POSTFIX_APPEND_MYDESTINATION_CF}" == "yes" ] || [ "${POSTFIX_APPEND_MYDESTINATION_CF}" == "true" ]; then
        echo "mydestination = \$myhostname, ${POSTFIX_MAILNAME}, ${HOSTNAME}, localhost.localdomain, localhost" >> /etc/postfix/main.cf
    fi
else
    if [ "${POSTFIX_APPEND_MYDESTINATION_CF}" == "yes" ] || [ "${POSTFIX_APPEND_MYDESTINATION_CF}" == "true" ]; then
        echo "mydestination = \$myhostname, ${HOSTNAME}, localhost.localdomain, localhost" >> /etc/postfix/main.cf
    fi
fi
if [ ! -z "${POSTFIX_TLS_CERT_PATH}" ]; then
    echo "smtpd_tls_cert_file=${POSTFIX_TLS_CERT_PATH}" >> /etc/postfix/main.cf
    echo "smtpd_tls_key_file=${POSTFIX_TLS_KEY_PATH}" >> /etc/postfix/main.cf
    chown postfix:postfix ${POSTFIX_TLS_CERT_PATH}
    chown postfix:postfix ${POSTFIX_TLS_KEY_PATH}
    chmod 644 ${POSTFIX_TLS_CERT_PATH}
    chmod 600 ${POSTFIX_TLS_KEY_PATH}
fi
if [ "${POSTFIX_APPEND_VIRTUAL_ALIAS_CF}" == "yes" ] || [ "${POSTFIX_APPEND_VIRTUAL_ALIAS_CF}" == "true" ]; then
    echo "virtual_alias_domains = ${POSTFIX_DOMAIN}" >> /etc/postfix/main.cf
    echo "virtual_alias_maps = hash:/etc/postfix/virtual" >> /etc/postfix/main.cf
fi
if [ ! -s /etc/postfix/virtual ] && [ ! -z "${POSTFIX_RELAY_TO_ADDRESS}" ]; then
    echo "@${POSTFIX_DOMAIN} ${POSTFIX_RELAY_TO_ADDRESS}" >> /etc/postfix/virtual
fi
if [ -s /etc/postfix/virtual ]; then
    postmap /etc/postfix/virtual
fi

if [ ! -s /etc/mail/dkim-keys/${POSTFIX_DOMAIN} ]; then
    mkdir -p /etc/mail/dkim-keys/${POSTFIX_DOMAIN}
    cd /etc/mail/dkim-keys/${POSTFIX_DOMAIN}
    opendkim-genkey -d ${POSTFIX_DOMAIN} --append-domain --subdomains
fi
echo "SET UP YOUR DKIM PUBLIC KEY ON default._domainkey.${POSTFIX_DOMAIN} IN TXT DNS RECORD:"
cat /etc/mail/dkim-keys/$POSTFIX_DOMAIN/default.txt

chown opendkim:opendkim /etc/mail/dkim-keys/${POSTFIX_DOMAIN}/default.private
chmod 600 /etc/mail/dkim-keys/${POSTFIX_DOMAIN}/default.private
chown opendkim:opendkim /etc/mail/dkim-keys/${POSTFIX_DOMAIN}/default.txt
chmod 600 /etc/mail/dkim-keys/${POSTFIX_DOMAIN}/default.txt
echo "KeyFile            /etc/mail/dkim-keys/${POSTFIX_DOMAIN}/default.private" >> /etc/opendkim.conf
echo "Domain             ${POSTFIX_DOMAIN}" >> /etc/opendkim.conf

echo "TrustedAuthservIDs smtp.${POSTFIX_DOMAIN}, mail.${POSTFIX_DOMAIN}, ${POSTFIX_DOMAIN}" >> /etc/opendmarc.conf


# postfix start-fg can be used instead without rsyslog or any of the lines below, though it is not nearly as verbose
service rsyslog start
service opendkim start
service opendmarc start
service postfix start
i=0
while [ $i -lt 5 ]
do
  ((i++))
  if test -f "/var/log/mail.log"; then
    echo "Tailing /var/log/mail.log ..."
    break
  fi
  echo "Waiting 1s for postfix to produce a log file to tail..."
  sleep 1
done
tail -f /var/log/mail.log &
# ensure container is terminated when postfix stops
while service postfix status > /dev/null
do
 sleep 1
done
kill -HUP $!