Haraka-plugin-resque NPM

haraka-plugin-resque

Haraka plugin that act as a queue and perform REST post to a remote url.

Ideal Setup

You're a SASS Provider (such as form submission like Wufoo) requiring to send email on-behalf-of client.

USAGE

SMTP-Client -> Haraka -> API -> Working-SMTP Server - using a different email sends on-behalf-of/sends-as your Client.

This plugin pushes your email to a REST API.

cd /path/to/local/haraka
npm install haraka-plugin-resque

# you should disable the default/dummy smtp_forward plugin
sed -i -e 's,^queue/smtp_forward,#queue/smtp_forward,' config/plugins

# this enable resque, if it's not already in config/plugins folder
grep -qxF 'resque' config/plugins || echo "resque" >> config/plugins

Next, copy and edit the default configuration.

cp node_modules/haraka-plugin-resque/config/resque.json config/resque.json
$EDITOR config/resque.json

# now restart haraka
service haraka restart

And what is this sends on-behalf-of?

The best method is to set the Reply-To header and play around with the From Name. For example, if we set the From Name as reply-to@your-client.com (original/client's from email) <-, then Outlook 365 would look like so reply-to@your-client.com <- <mail-service@your-sending-domain.com>

Then when user hit reply, it will go to/autofill with reply-to@your-client.com; which, if you look at from field, it look exactly like how it work reply-to@your-client.com <- <mail-service@your-sending-domain.com>

Ref: https://stackoverflow.com/questions/2782380/best-practices-sending-email-on-behalf-of-users

To run/debug locally

# run locally with
docker-compose up

To test locally, simply open a new terminal and exec:

# swaks can be install with homebrew on your macos
# type: PLAIN,LOGIN,CRAM-MD5
# note: -tls is important here if you want to test with authenticate
# https://github.com/haraka/Haraka/issues/2760#issuecomment-597248728
swaks -f test@github.com -t resque@github.com \
	--server localhost -tls --port 25 --auth LOGIN \
	--auth-user "usertest1" --auth-password "testes123"

Now you can view/edit the files in data/config and config/resque to manipulate your running container configurations. If you want a completely fresh start/restart, the cleanup.sh script be of help.

# to reset/restart, simply take down the existing docker containers
docker-compose down
# run to cleanup data folder files
./cleanup.sh
# start a new set of containers
docker-compose up

NOTE: It is recommended that you enable tls. See Haraka documentation here: https://haraka.github.io/plugins/tls

Since we allow sending with any FROM address, resque requires authentication. Therefore, we must configure resque.json with user credentials. We also need the following configurations for Hakara to work:

Enable tls in config/plugins - which is handled inside of data/mystart.sh
Because we enable tls, we'll need tls.ini - which is included in defaults/config/tls.ini
Set your server HOSTNAME inside of docker-compose for using OpenSSL generated self-signed cert.
Test it with -tls with swaks to confirm that STARTTLS is working. If you have SSL issue with certain email client (such as Wordpress SMTP plugin), then you might have to purchase an actual certificate with tls_cert.pem and tls_key.pem inside of data/config folder.

Note

To use self-signed cert with WP Mail SMTP plugin, make sure you disable verification with custom code:

<?php
add_filter('wp_mail_smtp_custom_options', function( $phpmailer ) {
	$phpmailer->SMTPOptions = array(
		'ssl' => array(
			'verify_peer'       => false,
			'verify_peer_name'  => false,
			'allow_self_signed' => true
		)
	);

	return $phpmailer;
} );