The extension can be downloaded here: Office 365 Pro Extension
Start Setup Wizard
After starting the setup wizard, Enter your name and Office365 email address.
The host will be detected automatically. Now press Next.
Select Office365 API then press Next.
Go to https://portal.azure.com/
In the Azure services, Go to App registrations.
Click on New registration.
Enter your name.
Select this option: Accounts in any organizational directory (Any Azure AD directory – Multitenant) and personal Microsoft accounts (e.g. Skype, Xbox)
Under URL (optional) select Web and Enter your domain URL.
After Registering, Go to Certificates & Secrets.
Then Click on New Client Secret.
Enter Description, Select Expires in then Add.
Copy Value and paste into App Secret.
Click on Overview. Copy Application (client) ID. Paste into App ID.
It will be looking like this, Now click on Next.
Click On Next.
Click on Finish.
You need to grant Office 365 permission. On the Post SMTP setup, Under Actions, click on Grant Office 365 Permission.
After that, you will be redirected to the Permission Requested page. Now click on Accept.
Now your Postman SMTP is configured and your website is ready to send Emails.