postfix/run.sh

#!/bin/bash

[ "${DEBUG}" == "yes" ] && set -x

[ -z "${SMTP_SERVER}" ] && echo "SMTP_SERVER is not set" && exit 1
[ -z "${SMTP_USERNAME}" ] && echo "SMTP_USERNAME is not set" && exit 1
[ -z "${SMTP_PASSWORD}" ] && echo "SMTP_PASSWORD is not set" && exit 1
[ -z "${SERVER_HOSTNAME}" ] && echo "SERVER_HOSTNAME is not set" && exit 1

SMTP_PORT="${SMTP_PORT-587}"

#Get the domain from the server host name
DOMAIN=`echo ${SERVER_HOSTNAME} |awk -F. '{$1="";OFS="." ; print $0}' | sed 's/^.//'`

# Set needed config options
postconf -e "myhostname = ${SERVER_HOSTNAME}"
postconf -e "mydomain = ${DOMAIN}"
postconf -e 'mydestination = $myhostname'
postconf -e 'myorigin = $mydomain'
postconf -e "relayhost = [${SMTP_SERVER}]:${SMTP_PORT}"
postconf -e "smtp_use_tls = yes"
postconf -e "smtp_sasl_auth_enable = yes"
postconf -e "smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd"
postconf -e "smtp_sasl_security_options = noanonymous"

# Create sasl_passwd file with auth credentials
if [ ! -f /etc/postfix/sasl_passwd ]; then
  grep -q "${SMTP_SERVER}" /etc/postfix/sasl_passwd  > /dev/null 2>&1
  if [ $? -gt 0 ]; then
    echo "Adding SASL authentication configuration"
    echo "[${SMTP_SERVER}]:${SMTP_PORT} ${SMTP_USERNAME}:${SMTP_PASSWORD}" >> /etc/postfix/sasl_passwd
    postmap /etc/postfix/sasl_passwd
  fi
fi

#Start services
supervisord