Send & Receive Issues

How to Fix Microsoft 365 Emails Going to Gmail and Yahoo Spam Folders

Partner Editor Oct 10, 2026 869 views

Question details

Users are experiencing issues where emails sent from their Microsoft 365 organization domain are landing in Gmail and Yahoo spam folders, despite having proper domain authentication.

How to Fix Microsoft 365 Emails Going to Gmail and Yahoo Spam Folders

Product: Microsoft 365
Device & OS: not provided
Scenario: Sending outgoing business or organizational emails to external email providers like Gmail and Yahoo.
Observed behavior: Emails are being filtered into the recipients' spam or junk folders even though SPF, DKIM, and DMARC checks are passing successfully.

Before you start

Before troubleshooting, ensure you have global admin or Exchange admin permissions in Microsoft 365 to access the message trace tools and DNS configurations.

Solution 1Recommended

Verify Authentication Records and Run a Message Trace

Confirm that your email authentication records are correctly set up and analyze the message path to identify potential filtering triggers.

Even if you believe your domain authentication is correct, minor syntax errors or propagation delays can cause failures at the recipient's end. Running a message trace helps pinpoint exactly how the recipient server evaluated your email.

Log in to the Admin Center

Access Exchange Admin Center

Navigate to 'Admin centers' and select 'Exchange'. Go to 'Mail flow' and click on 'Message trace'.

Run the Trace

Start a new trace by specifying the sender's email address and the external Gmail or Yahoo recipient addresses. Set the time range to cover the recent spam incidents.

Review Delivery Status

Analyze the trace results. Look for specific SMTP error codes, drop events, or bounce messages returned by Gmail or Yahoo that indicate why the message was flagged.

Verify Authentication Records and Run a Message Trace

Message Trace Limitations: Message trace data is readily available for the past 10 days. For emails older than 10 days, you must submit a request for an extended message trace which may take a few hours to generate.

Solution 2

Contact Microsoft 365 Support for Reputation Analysis

If all DNS records pass and emails are still marked as spam, Microsoft backend support needs to investigate IP reputation and routing data.

Free Microsoft Office alternative

Looking for a Lightweight Office Suite? Try WPS Office

While you troubleshoot your Microsoft 365 email delivery issues, consider WPS Office for your local document creation needs. It is a highly compatible, lightweight, and free alternative to Microsoft Office applications.

1. Download the Installer: Visit the official WPS Office website and click the Free Download button.
2. Install the Software: Run the downloaded installer file and follow the simple on-screen instructions to set up the suite.
3. Start Creating: Open WPS Office and instantly start working on your documents, spreadsheets, and presentations.

Seamless compatibility with Microsoft Word, Excel, and PowerPoint formats (.docx, .xlsx, .pptx).Lightweight design ensures fast startup and minimal system resource usage compared to heavy alternatives.Familiar user interface makes transitioning from Microsoft Office effortless and requires no new training.Built-in PDF toolkit allows you to easily edit, convert, and sign documents without switching apps.

microsoft office alternative - wps office

Frequently Asked Questions

Why do my Microsoft 365 emails go to spam if SPF, DKIM, and DMARC pass?

Authentication is only one part of email deliverability. Recipient providers like Gmail and Yahoo also use complex filtering algorithms that evaluate sender reputation, domain age, user engagement rates, and message content (such as spammy keywords or broken links).

How can I check my domain's sender reputation with external providers?

You can register your domain with external reputation tools like Google Postmaster Tools for Gmail or Yahoo's Sender Hub. These services allow you to monitor your domain's reputation, spam complaint rates, and delivery errors specifically for their platforms.

Will warming up a new Microsoft 365 domain prevent emails from going to spam?

Yes. If your domain is newly registered, sending a large volume of emails immediately is highly likely to trigger spam filters. Gradually increasing your daily sending volume (domain warmup) helps establish a positive sender reputation with major email providers.

What specific details should I look for in the Microsoft 365 Message trace?

In the Message trace results, pay close attention to the 'Status' column and expand the message events. Look for specific SMTP error codes or bounce messages returned by the destination servers, which often explain why the message was delayed, rejected, or filtered into spam.

Outlook & Email Problems