Ricoh scan to email with Microsoft 365
Ricoh supports OAuth 2.0 for Microsoft 365 on many models, but only after a firmware update, and the version you need differs by model. Ricoh keeps the official list.
Last verified: November 14, 2026
Minimum firmware for common models
From Ricoh's list of products with OAuth 2.0 firmware already released (Ricoh: support for affected Ricoh products). Check the full list there for your exact model; it also covers MP, P, SP and production models, some of which need firmware from your Ricoh dealer.
| Model | OAuth firmware |
|---|---|
| IM C2000 / C2500 / C3000 / C3500 / C4500 / C5500 / C6000 | 8.05 |
| IM C2010 / C2510 / C3010 / C3510 / C4510 / C5510 / C6010 | 2.05 |
| IM C3010SD / C3510SD / C4510SD / C6010SD | 1.03 |
| IM C6500 / C8000 | 8.05 |
| IM C6510 / C8010 | 1.04 |
| IM C7010 | 2.04 |
| IM C3501CE / C5501CE | 1.02 |
Most of these update with the RICOH Firmware Update Tool. If your model isn't on Ricoh's list, it won't get OAuth; use another fix below.
Set up OAuth
After updating the firmware, follow Ricoh's own guide (Ricoh KB: scan to email with Exchange Online OAuth 2.0). The device uses smtp.office365.com, port 587 and STARTTLS, and you sign in to Microsoft with a code shown by the device.
Still getting "535 Authentication unsuccessful"?
A common cause: your Microsoft 365 admin hasn't granted consent for Ricoh's app. In Microsoft Entra ID, the Ricoh enterprise application should show the SMTP.Send and offline_access permissions as "Granted for" your organization. Also check that Authenticated SMTP is enabled for the sending mailbox. (Source: Microsoft Q&A.)
If your model can't use OAuth
Use one of the other fixes on the main guide: Microsoft's direct send (internal recipients only), Microsoft's SMTP relay connector (needs a static public IP), or a third-party relay service. As a short-term stopgap, your Microsoft 365 admin can turn password sign-in back on after the December switch-off.
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