Postbox supports modern authentication and Multi-factor authentication (MFA/Duo) for Office 365. Postbox must be configured as follows.
Enter the configuration details indicated on the screenshot if this is the first time that you are configuring Postbox.
- Navigate to Postbox > Preferences
- Select the Accounts Tab
Incoming Mail Server
Outgoing Mail Server
- On the left navigation go to Ongoing Server
- Configure the account settings as indicated on the screenshot