Configuring Nanobox to Use nullmailer

boxfile.yml

# add nullmailer as an extra package
run.config:
  ...
  extra_packages:
    - nullmailer
 
# curl the setup-nullmailer script and run it as a transform hook 
deploy.config:
  transform:
    - bash <(curl -sL https://git.io/vAgf3)

# start the nullmailer server in whatever component(s) is/are sending mail
web.site:
  start:
    mail: /data/libexec/nullmailer/nullmailer-send

Environment Variables

SMTP_HOST=smtp-host
SMTP_PORT=smtp-port
SMTP_USER=smtp-username
SMTP_PASS=smtp-password
SMTP_TLS=tls|ssl
SMTP_AUTH=login|plain

setup-nullmailer.sh

#!/usr/bin/env bash

ln -sf /data/libexec/nullmailer/sendmail /data/bin/
mkdir -p /data/var/spool/nullmailer/{failed,queue}
mkfifo /data/var/spool/nullmailer/trigger

echo "${APP_NAME}" > /data/etc/nullmailer/defaulthost
echo "nanoapp.io" > /data/etc/nullmailer/defaultdomain
echo "${APP_NAME}.nanoapp.io" > /data/etc/nullmailer/me
echo "${SMTP_USER}" > /data/etc/nullmailer/adminaddr

if [[ -n "${SMTP_PORT}" ]]; then
  options="--port=${SMTP_PORT}"
fi

if [[ "${SMTP_TLS}" == "tls" || "${SMTP_TLS}" == "ssl" ]]; then
  options="${options} --tls"
elif [[ "${SMTP_TLS}" == "starttls" ]]; then
  options="${options} --starttls"
fi

if [[ "${SMTP_AUTH}" == "login" ]]; then
  options="${options} --auth-login"
fi

echo "${SMTP_HOST} smtp --user='${SMTP_USER}' --pass='${SMTP_PASS}' ${options}" > /data/etc/nullmailer/remotes