Example setup for GreenMail and nodemailer

Test setup for reproducing #380

greenmail-docker/clients/nodemailer/Dockerfile

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+FROM node:lts-alpine
+
+ENV NODE_ENV=production \
+    NPM_CONFIG_PRODUCTION=true
+
+WORKDIR /nodemailer
+RUN addgroup nodemailer && \
+    adduser -S nodemailer nodemailer && \
+    chown -R nodemailer:nodemailer /nodemailer
+USER nodemailer:nodemailer
+COPY --chown=nodemailer server.js /nodemailer/server.js
+RUN npm install --save nodemailer
+
+ENTRYPOINT [ "node","/nodemailer/server.js" ]

greenmail-docker/clients/nodemailer/README.md

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+GreenMail test setup with nodemailer
+=========
+
+This is a POC showing a GreenMail and [nodemailer](https://github.com/nodemailer/nodemailer) setup, configuring nodemailer to send a single message to GreenMail.
+
+Run `docker-compose up --build` and use eg Thunderbird to verify
+
+|Port|Description|
+|----|-----------|
+|3025| GreenMail SMTP | 
+|3143| GreenMail IMAP | 
+|8080| GreenMail API  | 

greenmail-docker/clients/nodemailer/docker-compose.yml

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+version: '3'
+services:
+  greenmail:
+    image: greenmail/standalone:1.6.3
+    environment:
+    # Enable GreenMail verbose mode
+    - GREENMAIL_OPTS=-Dgreenmail.setup.test.smtp -Dgreenmail.setup.test.imap -Dgreenmail.setup.api -Dgreenmail.hostname=0.0.0.0 -Dgreenmail.auth.disabled -Dgreenmail.verbose
+    ports:
+    - "3025:3025"
+    - "3143:3143"
+    - "8080:8080"
+  nodemailer:
+    build:
+      context: .
+    links:
+    - greenmail

greenmail-docker/clients/nodemailer/server.js

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+// From https://nodemailer.com/about/#example
+
+"use strict";
+const nodemailer = require("nodemailer");
+
+// async..await is not allowed in global scope, must use a wrapper
+async function main() {
+  // create reusable transporter object using the default SMTP transport
+  let transporter = nodemailer.createTransport({
+    host: "greenmail",
+    port: 3025,
+    secure: false,
+    //auth: {
+    //  user: 'foo',
+    //  pass: 'bar',
+    //},
+    debug: true,
+    logger: true,
+  });
+
+  // send mail with defined transport object
+  let info = await transporter.sendMail({
+    from: '"Fred Foo 👻" <[email protected]>', // sender address
+    to: "[email protected], [email protected]", // list of receivers
+    subject: "Hello ✔", // Subject line
+    text: "Hello world?", // plain text body
+    html: "<b>Hello world?</b>", // html body
+  });
+
+  console.log("Message sent: %s", info.messageId);
+}
+
+main().catch(console.error);
+