Does Nodemailer SMTP work within azure functions? - node.js

Question

I'm trying to run a nodemailer service within an azure function app and it keeps throwing AUTH error. Here's my code below :
require("dotenv").config();
const nodemailer = require("nodemailer");
const getMailIDs = require("./getMailIDs");
module.exports = async function mailSender() {
let transporter = nodemailer.createTransport({
host: "smtp.gmail.com",
port: 465,
secure: true,
service: "gmail",
auth: {
user: process.env.EMAIL,
pass: process.env.PASSWORD,
},
});
let mailIDs = await getMailIDs();
for (i = 0; i < mailIDs.length; i++) {
await transporter.sendMail({
from: "abc#gmail.com",
to: `${mailIDs[i]}`,
subject: "Test Mail",
text: {
path: `emailBody.txt`,
},
});
}
};
This is the error thrown :
Error: Missing credentials for "PLAIN"
at SMTPConnection._formatError (C:\Projects\azure\node_modules\nodemailer\lib\smtp-connection\index.js:784:19)
at SMTPConnection.login (C:\Projects\azure\node_modules\nodemailer\lib\smtp-connection\index.js:438:38)
at C:\Projects\azure\node_modules\nodemailer\lib\smtp-transport\index.js:271:32
at SMTPConnection.<anonymous> (C:\Projects\azure\node_modules\nodemailer\lib\smtp-connection\index.js:209:17)
at Object.onceWrapper (events.js:299:28)
at SMTPConnection.emit (events.js:210:5)
at SMTPConnection._actionEHLO (C:\Projects\azure\node_modules\nodemailer\lib\smtp-connection\index.js:1319:14)
at SMTPConnection._processResponse (C:\Projects\azure\node_modules\nodemailer\lib\smtp-connection\index.js:947:20)
at SMTPConnection._onData (C:\Projects\azure\node_modules\nodemailer\lib\smtp-connection\index.js:749:14)
at TLSSocket.SMTPConnection._onSocketData (C:\Projects\azure\node_modules\nodemailer\lib\smtp-connection\index.js:189:44) {
code: 'EAUTH',
command: 'API'
}
It executes when I run this script file alone locally. But throws an error when I call it from index.js file of the azure function app. I'm unsure if using google api/ OAUTH is mandatory for azure function app.

Answer 1

Your error code shared shows that NodeMailers is unable to verify your identity.
code: 'EAUTH', command: 'API'
Issue found:
auth: {
user: process.env.EMAIL,
pass: process.env.PASSWORD,
},
Authentication variables used are environment variable.
This works when running locally because you must have an .env file with these variables hosted on your local server.
Solution:
You need to add all environment variables under as "New Application Settings" under "Application Settings" in "Configuration" (Settings Panel).
Doc reference - https://learn.microsoft.com/en-us/azure/azure-functions/functions-how-to-use-azure-function-app-settings?tabs=portal
Add the values as under :
Name - EMAIL , value - <youremail>
Name - PASSORD, value - <password>
This should fix the auth issue.