If you are a new user to Office365 and use EQ to send email via SMTP you may experience an error message "invalid authentication" when attempting to send emails. This is because Office365 has defaulted to disabling a setting that EQ, and any other email client requires.
If you are experiencing the "invalid authentication" error on an existing Microsoft 365 account see this article on app passwords.
To enable authenticated SMTP email sending follow these steps in Office 365.
- Open your web browser and login at www.office.com as an administrator user for your business.
- Click the Admin settings icon:
- Click the User management box in the middle:
- Click on an effected username in the list, a panel of settings on the right will be displayed.
- Click the Mail tab:
- Click Manage email apps:
- Tick Authenticated SMTP to enable it:
- Click Save changes at the bottom.
You may need to repeat this step for each Office 365 user that is effected. You can then sign out and close your browser.
Re-open EQ and try to send your email again.