Bootstrap Email Mail Gateway Service

This is a cookbook recipe that makes use of midi-smtp-server and Bootstrap Email to process incoming E-Mails through Bootstrap Email to finally transfer the mail to some relay host.

Settings

The service may be adjusted by some ENV variables:

BOOTSTRAP_EMAIL_RELAY_HOST

The relay host to forward the mail. It must be provided.

BOOTSTRAP_EMAIL_RELAY_PORT="465"

The relay host port.

BOOTSTRAP_EMAIL_RELAY_USERNAME=""

The relay host username.

BOOTSTRAP_EMAIL_RELAY_PASSWORD=""

The relay host password.

BOOTSTRAP_EMAIL_RELAY_TLS="false"

Set to true if relay host require STARTTLS.

BOOTSTRAP_EMAIL_RELAY_SSL="false"

Set to true if relay host require SSL.

BOOTSTRAP_EMAIL_RELAY_ENABLE_STARTTLS="false"

BOOTSTRAP_EMAIL_RELAY_ENABLE_STARTTLS_AUTO="false"

BOOTSTRAP_EMAIL_RELAY_OPENSSL_VERIFY_MODE="none"

Valid values: https://ruby-doc.org/stdlib-2.5.1/libdoc/openssl/rdoc/OpenSSL/SSL.html

• CLIENT_ONCE
• FAIL_IF_NO_PEER_CERT
• NONE
• PEER

BOOTSTRAP_EMAIL_GW_HOSTS="0.0.0.0"

The ip-address(es) the mail gateway is listen on.

BOOTSTRAP_EMAIL_GW_PORTS="25"

The port(s) the mail gateway is listen on.

BOOTSTRAP_EMAIL_GW_MAX_PROCESSINGS="4"

The number of simultaneously processes.

BOOTSTRAP_EMAIL_GW_MAX_CONNECTIONS="100"

The number of simultaneously connections.

BOOTSTRAP_EMAIL_GW_INTERNATIONALIZATION=""

Enable internationalization smtp extension.

BOOTSTRAP_EMAIL_GW_DEBUG=""

Enable SMTP session debug logs.

Usage

export BOOTSTRAP_EMAIL_RELAY_HOST="some.smtp.server"
export BOOTSTRAP_EMAIL_GW_DEBUG="true"
ruby service/bootstrap-email-smtp-server.rb

Usage with Docker

docker build --tag bootstrap-email-smtp-server .
docker run -it --name bootstrap-email-smtp-server --publish 25:25 \
  --env BOOTSTRAP_EMAIL_RELAY_HOST="some.smtp.server." \
  --env BOOTSTRAP_EMAIL_GW_DEBUG=1 bootstrap-email-smtp-server

Author & Credits

Author: Kumy

Based on Slack recipe from Tom Freudenberg, 4commerce technologies AG, released under the MIT license