Setup guides
- SMTP AUTH basic authentication retirement in Exchange OnlineMicrosoft is disabling SMTP AUTH basic authentication in Exchange Online by default at the end of December 2026. What changes, which devices break, and your options.
- Fix "550 5.7.30 Basic authentication is not supported for Client Submission"What the Exchange Online error 550 5.7.30 means for scanners, copiers and apps, and how to fix it without enabling basic auth again.
- Fix "535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled"Exchange Online error 535 5.7.139 "SmtpClientAuthentication is disabled for the Tenant" or "for the Mailbox": what it means and how to fix scan-to-email.
- Scan-to-email setup for Microsoft 365 on common copiersWhere to find the SMTP settings on Ricoh, Canon, Xerox, HP, Brother, Konica Minolta, Kyocera, Sharp and Epson devices, and what to enter for Microsoft 365 after basic auth.
- Scripts and apps: sending through Microsoft 365 after basic authPowerShell Send-MailMessage, Python smtplib, .NET and WordPress SMTP settings for sending through Microsoft 365 after SMTP AUTH basic authentication is retired.
- Restrict SMTPKeep to specific mailboxesLimit which mailboxes an app with Mail.Send permission can send as, using an Exchange Online application access policy and a mail-enabled security group.
SMTPKeep