Oracle Cloud Infrastructure Email Delivery is an email sending service that provides a fast and reliable managed solution for sending high-volume emails that need to reach your recipients’ inbox. Email Delivery provides the tools necessary to send application-generated email for mission-critical communications such as receipts, fraud detection alerts, multi-factor identity verification, and password resets.
Go to a IAM/user and click on [Generate SMTP Credentials] as shown below:

Keep the credentials created in a safe place:

Create an Approved Sender (an real existing email account to put in the from field):

Grab the connection details:

npm install nodemailer
Create a sendmail.js file:
var nodemailer = require('nodemailer'); async function main() { let testAccount = await nodemailer.createTestAccount(); let transporter = nodemailer.createTransport({ host: "smtp.email.eu-frankfurt-1.oci.oraclecloud.com", port: 25, secure: false, auth: { user: 'ocid1.user.oc1..aaaaaa...om', pass: 'BD..._', }, }); let info = await transporter.sendMail({ from: '"javier...om', to: "javi...om", subject: "ssh access to 10.0.2.94", html: "<b>ssh -i deltakey -o ProxyCommand=\"ssh -i deltakey -W %h:%p -p 22 ocid1.bast...oud.com\" -p 22 opc@10.0.2.94</b>", }); console.log("Message sent: %s", info.messageId); console.log("Preview URL: %s", nodemailer.getTestMessageUrl(info)); } main().catch(console.error);
Test it:
node sendmail.js


That’s all, hope it helps! 🙂
Gives 535 error when secure is false. When secure is true, there is an error with sslv3, which also added via ttl option in nodemailer transporter.
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