Nodemail x Node.js: Failed auth although tested with success - node.js

Question

I am having a problem with a nodemailer Firebase Function supposed to send emails through an SMTP transporter.
It is strange because I am testing my connection with success using:
// check server readiness
const serverReady = await new Promise<boolean>(resolve => {
transporter.verify( (err: any, succ: any) => {
if (err) {
console.log(err);
resolve(false);
} else {
console.log('Server is ready to take our messages');
resolve(true);
}
});
})
Which prints Server is ready to take our messages.
Then after setting up my envelope andsending it with th .sendMail method I get this error:
Unhandled error { Error: Mail command failed: 530 5.5.1 Authentication Required.
at SMTPConnection._formatError (/srv/node_modules/nodemailer/lib/smtp-connection/index.js:777:19)
at SMTPConnection._actionMAIL (/srv/node_modules/nodemailer/lib/smtp-connection/index.js:1546:34)
at SMTPConnection._responseActions.push.str (/srv/node_modules/nodemailer/lib/smtp-connection/index.js:1028:18)
at SMTPConnection._processResponse (/srv/node_modules/nodemailer/lib/smtp-connection/index.js:935:20)
at SMTPConnection._onData (/srv/node_modules/nodemailer/lib/smtp-connection/index.js:742:14)
at TLSSocket.SMTPConnection._onSocketData.chunk (/srv/node_modules/nodemailer/lib/smtp-connection/index.js:195:44)
at emitOne (events.js:116:13)
at TLSSocket.emit (events.js:211:7)
at addChunk (_stream_readable.js:263:12)
at readableAddChunk (_stream_readable.js:250:11)
at TLSSocket.Readable.push (_stream_readable.js:208:10)
at TLSWrap.onread (net.js:601:20)
code: 'EENVELOPE',
response: '530 5.5.1 Authentication Required.',
responseCode: 530,
command: 'MAIL FROM' }
The error is pretty clear: Failed Auth but it's strange since the test worked earlier!
Connection parameters are:
// options to connect to server
const smtpOptions = {
host: 'smtp.zoho.eu',
port: 465,
secure: true,
auth: {
user: functions.config().nodemailer.user,
pass: functions.config().nodemailer.pass
}
};
// transporter for sending the email
const transporter = nodeMail.createTransport( smtpOptions );
Thank you guys in advance

Answer 1

transporter.verify only tests the connection and authentication, it looks like the that you are not authorised to use the particular MAIL FROM address.