Email Sending Error with Passwordless Connection and Office 365 as Email Provider

Sep 10, 2025

Overview

When setting up SMTP for Office 365 and testing via the Send test email button on the Custom Email Provider page, the test email is successfully received. However, an error occurs when attempting to send a test email through the Passwordless Connection Email page. The error message displayed is:

Type FN error: Error sending email.

Solution

To resolve the email sending error in the Passwordless Connection setting, the format of the FROM field needs adjustment to comply with Microsoft's requirements. Modify the FROM field to contain only the email address instead of the application's name and the email.

Step 1: Access the Email Passwordless connection (Authentication > Passwordless > Email)
Step 2: Locate the FROM field, which currently is set as below:

{{ application.name }} <no-reply@funvideos.fun>

Screenshot 2024-05-13 at 17.46.26.png

Step 3: Change this to the FROM to match the pattern below:

no-reply@funvideos.fun

Step 4: Press Save

After making these changes, test sending an email again through the Passwordless Connection Email page to ensure the issue is resolved.

Related References

For more information on configuring SMTP settings for Office 365, refer to the Official Microsoft Office 365 SMTP Configuration Guidelines.