Send & Receive Issues

Fix Konica Minolta SMTP Error 535 When Sending Through Microsoft 365

Bushra Parveen Sep 28, 2026 869 views

Question details

A user is experiencing SMTP Error 535 when attempting to send emails from a Konica Minolta printer via Microsoft 365, despite verifying credentials and standard SMTP settings.

Fix Konica Minolta SMTP Error 535 When Sending Through Microsoft 365

Product: Microsoft 365
Device & OS: not provided
Scenario: Configuring a Konica Minolta printer to scan and send emails using smtp.office365.com on port 587.
Observed behavior: The printer fails to send emails and returns an SMTP Error 535, indicating that authentication has been rejected by the Microsoft 365 server.

Before you start

Ensure you have Global Administrator or Exchange Administrator access to the Microsoft 365 Admin Center, and verify that the mailbox you are using for the printer is licensed and active.

Solution 1Recommended

Contact Microsoft 365 Support for Server-Side Resolution

Since Error 535 indicates an authentication rejection that often involves hidden tenant-level security settings, contacting Microsoft Support is the most effective way to identify what is blocking the connection.

SMTP Error 535 means that authentication failed. Even if your credentials, TLS/SSL settings, and ports are correctly configured on the Konica Minolta printer, Microsoft 365 features like Security Defaults, Conditional Access policies, or disabled SMTP AUTH can silently block legacy authentication requests.

Because these backend tenant and mailbox settings cannot be fully diagnosed through a public forum, working directly with Microsoft 365 business support allows them to inspect your specific server-side logs and identify the exact policy causing the rejection.

Log in to the Admin Center

Navigate to admin.microsoft.com and log in using your Microsoft 365 global admin or Exchange admin credentials.

Open a new service request

Click on the 'Support' tab on the left-hand navigation menu, then select 'Help & support' or 'New service request'.

Describe the issue

Enter a specific description of the problem, such as 'SMTP Error 535 on Konica Minolta printer using smtp.office365.com port 587'.

Provide necessary details

Supply the support agent with your printer model, the exact authentication method configured, your tenant details, the specific mailbox email address, and the complete SMTP error code.

Request specific security checks

Ask the support agent to verify if 'SMTP AUTH' is disabled for that specific mailbox, or if 'Security Defaults' and 'Conditional Access' policies are actively blocking legacy SMTP authentication.

Contact Microsoft 365 Support for Server-Side Resolution

Preparation Tip: Have a printout or screenshot of the complete error log from your Konica Minolta printer's web interface ready before contacting support to speed up their investigation.

Solution 2

Manually Verify SMTP AUTH and Security Defaults in Microsoft 365

You can manually check if authenticated SMTP is enabled for the specific mailbox and verify that security defaults are not blocking legacy authentication.

Free Microsoft Office alternative

Enhance Your Document Workflow with WPS Office

While resolving Microsoft 365 network and SMTP errors requires administrator access, managing the documents you scan and email doesn't have to be complicated. WPS Office provides a lightweight, highly compatible alternative for handling your daily document and PDF needs.

Fully compatible with Microsoft Word, Excel, and PowerPoint file formatsBuilt-in PDF editing tools ideal for managing documents scanned from your printerLightweight application that runs smoothly and requires minimal system resourcesFree and intuitive user interface for seamless office productivity

microsoft office alternative - wps office

Frequently Asked Questions

What does SMTP Error 535 mean?

SMTP Error 535 generally translates to 'Authentication unsuccessful'. It occurs when the email server rejects the provided username and password, or when the server's security policies actively block the authentication protocol being used by the device.

Why is my Konica Minolta printer failing to connect to smtp.office365.com even with the correct password?

Microsoft 365 has deprecated basic authentication and often enables 'Security Defaults' automatically on tenants. This blocks the traditional basic SMTP authentication used by many legacy printers and scanners, resulting in an Error 535 even if the password is 100% correct.

Can I use an app password for my printer to bypass Error 535?

Yes, if Multi-Factor Authentication (MFA) is enforced on the Microsoft 365 account, you cannot use the standard password. You must generate an App Password in your Microsoft 365 security settings and enter that into the printer's password field.

How do I set up a printer scanner if SMTP AUTH is strictly disabled in my organization?

If SMTP AUTH cannot be enabled due to organization policies, you can use Microsoft 365 Direct Send (using port 25 without authentication, though it only sends to internal recipients) or configure a Microsoft 365 SMTP Relay using a static IP address or certificate.

Outlook & Email Problems