If your Joomla Global Configuration sends mail through smtp.office365.com with a username and password, it depends on SMTP basic authentication, which Microsoft disables by default at the end of December 2026. Here is how to spot it in Joomla and move to Microsoft Graph with OAuth 2.0.

Send WordPress emails through Microsoft 365, Outlook or Exchange Online with OAuth 2.0 and Microsoft Graph, without storing SMTP passwords.