SMTP Basic Authentication Disablement

Announcements Arpan Das

01/04/2026 11:00:00 AM

SMTP Basic Authentication has now been disabled for accounts sending email via Exchange Online. Primary Local Admins and Local Admins should have received communications regarding any accounts within their organisation that required action to be taken.

Any Application accounts still using Basic Authentication via Exchange Online will now cease to function and must be transitioned to Oauth2.0.

Further details on protocol deprecation and how to transition to Oauth2.0 can be found HERE.

If you need to report any issues, please contact the NHS.net Connect Helpdesk 24/7 by calling 0333 200 1133 or emailing helpdesk@nhs.net.