postfix config for vagrant ubuntu machine

postfix_part.sh

if [[ ! -e $dirReceipts/postfix ]]
then 
  # doc found on
  # https://www.linode.com/docs/email/postfix/postfix-smtp-debian7
  # https://www.howtoforge.com/postfix_relaying_through_another_mailserver
  export DEBIAN_FRONTEND=noninteractive
  apt-get -qy purge mailutils postfix
  apt-get install -qy postfix mailutils
  # var
  mailadmin="[email protected]"
  mailfrom="[email protected]"
  pwdmailfrom="mypassword"
  relayhost="smtp.relay.com"
  relayport=587
  # postfix config
  postconf -e "relayhost = [$relayhost]:$relayport"
  postconf -e "smtp_sasl_auth_enable = yes"
  postconf -e "smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd"
  postconf -e "smtp_sasl_security_options = noanonymous"
  echo "$relayhost  $mailfrom:$pwdmailfrom" | tee -a /etc/postfix/sasl_passwd
  chown root:root /etc/postfix/sasl_passwd
  chmod 600 /etc/postfix/sasl_passwd
  postmap /etc/postfix/sasl_passwd
  /etc/init.d/postfix restart
  echo "postfix has been installed" | mail -s "provisioning" -a "From: $mailfrom" $mailadmin
fi