SMTP Auth issue

Question

Hello

Please i need your help on this issue.

I have a problem with “Scan to E-Mail”, because Microsoft switched off the SMTP with the Basic Auth. 

I can only send Scans to E-Mails in the same domain, but not outside (for example yahoo or gmail).

My Scanner have not the new OAuth2.0. Can you help me to find an solution?

Answer 1

Hi Rita Rita,

Thank you for posting your question in the Microsoft Q&A forum. 

First, I’d like to clarify one point: based on Microsoft’s official roadmap, Basic Authentication for SMTP AUTH (Client Submission) will start being disabled in March 2026 and fully retired by April 2026. This means that, as of today, you should still be able to use the SMTP Client Submission method normally.

However, you mentioned:

“I can only send Scans to E-Mails in the same domain, but not outside (for example yahoo or gmail)”

This behavior is typical of the Direct Send method, which has the limitation of not being able to deliver emails to external recipients. Could you confirm which method your scanner is currently using?

That said, it seems you are looking for an alternative solution for your scanner (which does not support OAuth 2.0) that can send emails to both internal and external recipients. Based on my research and Microsoft’s recommendations, here are two options you can consider:

1. Azure Communication Services (ACS) Email

• Microsoft recommends ACS Email for sending messages to both internal and external recipients.
• This approach uses SMTP over ACS or APIs and is fully modern-auth compliant.
• You can review the requirements and implementation details here: Email SMTP support in Azure Communication Services.

2. SMTP Relay via Microsoft 365

• Configure an inbound connector in Microsoft 365 to relay email from your device or application.
• Requirements:
  • TLS (mandatory)
  • Port 25 open
  • Authentication: either Certificate-based, or Static public IP address (not shared with another organization)
• This method allows sending to both internal and external recipients if configured correctly.
• Full guidance is available here: https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365#smtp-relay-configure-a-connector-to-relay-email-from-your-device-or-application-through-microsoft-365-or-office-365

I hope these suggestions help you move forward.

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