SMTP AUTH
4 articles tagged SMTP AUTH.
Block legacy authentication in Microsoft 365 without breaking printers
Find every device and app that still signs in with legacy authentication, move printers and scanners to a supported sending method, then block legacy auth with Conditional Access.
Fix 550 5.7.30 Basic authentication is not supported for Client Submission
A printer, scanner or app stopped sending mail through Exchange Online with 550 5.7.30. Find the sender and move it to OAuth, High Volume Email or an SMTP relay connector.
SMTP AUTH vs Direct Send vs relay connector: sending mail from devices
Compare SMTP AUTH, Direct Send, an SMTP relay connector, High Volume Email and Azure Communication Services, and pick the right way for printers and apps to send through Microsoft 365.
SMTP AUTH with OAuth client credentials for apps on Exchange Online
Move an application from Basic auth SMTP to OAuth: register an Entra app with SMTP.SendAsApp, register its service principal in Exchange Online and send with SASL XOAUTH2.