How to connect a smtp with firebase?

@lizzie 

To connect a SMTP server with Firebase, you will need to use Firebase Cloud Functions to send emails through the SMTP server. Here's a step-by-step guide on how to do this:

1. Set up a Firebase project: Create a Firebase project in the Firebase Console if you haven't already.
2. Install Firebase CLI: Install the Firebase command-line interface (CLI) using npm by running the following command in your terminal:

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npm install -g firebase-tools

1. Initialize Firebase functions: In your terminal, navigate to your project directory and run the following command to initialize Firebase functions:

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firebase init functions

1. Install nodemailer: Inside the functions directory, install the nodemailer library using npm:

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npm install nodemailer

1. Write a Cloud Function to send emails: Create a new Cloud Function in the index.js file inside the functions directory. Here's an example Cloud Function that sends an email using a SMTP server:

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const functions = require('firebase-functions');
const nodemailer = require('nodemailer');

exports.sendEmail = functions.https.onRequest((req, res) => {
  const transporter = nodemailer.createTransport({
    host: 'smtp.your-smtp-server.com',
    port: 587,
    secure: false,
    auth: {
      user: 'your-smtp-username',
      pass: 'your-smtp-password'
    }
  });

  const mailOptions = {
    from: 'your-email@example.com',
    to: 'recipient@example.com',
    subject: 'Test email',
    text: 'This is a test email from Firebase Cloud Functions'
  };

  transporter.sendMail(mailOptions, (error, info) => {
    if (error) {
      console.log(error);
      res.status(500).send(error);
    } else {
      console.log('Email sent: ' + info.response);
      res.status(200).send('Email sent');
    }
  });
});

1. Deploy the Cloud Function: Deploy the Cloud Function to Firebase using the following command:

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firebase deploy --only functions

1. Test the Cloud Function: You can now test the Cloud Function by sending an HTTP request to the URL provided in the Firebase console after deployment.

That's it! You have now connected a SMTP server with Firebase using Cloud Functions. You can customize the Cloud Function to send emails with dynamic content, attachments, etc. depending on your requirements.