Nodemailer with Docker

Question

I'm trying to send some emails from a docker container running express through register365.

This is the code used

export class Emailer {
transporter: nodemailer.Transporter;
constructor() {
    this.transporter = nodemailer.createTransport(smtpTransport({
        host: 'smtp.reg365.net',
        auth: {
            user: 'myuser',
            pass: mypassword'
        }
    }));
}

public async sendEmail(to,body) {
    try {
        return await this.transporter.sendMail({to,from: '"TEST" ',text: body, subject: ' WE NEED THE CONTENT AND DESIGN OF THIS EMAIL!!!!'});
    }
    catch(error) {
        console.log('Email error');
        console.dir(error);
    }

}
}

That's working all fine if I run the express with npm start but If I run it with docker it'll fail with this error Error: Connection closed

It only fails using smtp.reg.356.net, if I use Gmail it'll work perfectly

This is the docker file I'm using

FROM  node:8

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

RUN npm install -g nodemon

COPY package.json /usr/src/app/
RUN npm install

COPY ./dist /usr/src/app/dist

EXPOSE 3005
EXPOSE 25
CMD [ "npm", "start" ]

Many thanks.

EDIT: As requested, running telnet smtp.reg365.net 25 returns this telnet: could not resolve smtp.reg.356.net/25: Name or service not known

Output of cat /etc/resolv.conf on the host machine

domain Hitronhub.home
nameserver 89.101.160.5
nameserver 89.101.160.4

On the docker container

search hitronhub.home
nameserver 127.0.0.11
options ndots:0

Nodemailer with Docker

1 Answers