Account Security Problems

How to Verify if an Email from eu.yammer.com is Legitimate

Khadija Khan Oct 19, 2026 869 views

Question details

The user needs to determine whether an email notification originating from a domain ending in eu.yammer.com is a legitimate message from Microsoft Yammer or a potential phishing attempt.

How to Verify if an Email from eu.yammer.com is Legitimate

Product: Microsoft Yammer
Device & OS: not provided
Scenario: Evaluating a suspicious email sender address ending in eu.yammer.com to ensure account security.
Observed behavior: The user received an email from eu.yammer.com instead of the standard yammer.com address and is unsure if it is safe to interact with the message.

Before you start

Do not click any links, open attachments, or reply to the message until you have thoroughly verified the sender's identity and the email's legitimacy.

Solution 1Recommended

Inspect the Sender Details and Email Headers

Verifying the underlying email headers and checking for exact domain matches is the most reliable way to confirm authenticity.

Although eu.yammer.com can sometimes be associated with European Microsoft tenants, sender addresses can be easily spoofed. You must review the complete sender address, email headers, and authentication results to ensure the email genuinely originated from Microsoft.

Check the full sender address

Hover over or tap the sender's name in your email client to view the exact email address. Ensure there are no subtle misspellings or extra characters in the domain.

Examine the destination of links

Hover your mouse over any buttons or links in the email without clicking them. Check if the URL preview displays a trusted Microsoft or Yammer domain.

Analyze the email headers

Open the email properties or message details in your email client (e.g., File > Properties in Outlook). Look for the 'Authentication-Results' section in the Internet headers to confirm that SPF, DKIM, and DMARC checks have 'pass' statuses.

Inspect the Sender Details and Email Headers

Protect Personal Information: If you plan to share a screenshot of the email with your IT support team or a community forum for further help, make sure to blur or remove all personal information first.

Solution 2

Verify Notifications Directly via Microsoft 365

Bypassing the email entirely and checking your account directly eliminates the risk of falling for a phishing attempt.

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Frequently Asked Questions

Why do most Yammer emails come from yammer.com instead of eu.yammer.com?

The standard global notification domain for Yammer is yammer.com. However, Microsoft operates regional data centers, and notifications for European tenants might sometimes route through eu.yammer.com. Regardless of the domain, always verify the email headers to ensure it is not spoofed.

What should I do if the eu.yammer.com email asks for my password or payment?

Legitimate Microsoft Yammer emails will never ask you to reply with your password or demand urgent payments. Treat any such emails as severe phishing attempts, do not click any links, and report them to your IT security team immediately.

How do I report a suspicious Yammer email?

If you are using Outlook, you can use the built-in 'Report Phishing' button. Alternatively, you can forward the suspicious email as an attachment to your organization's dedicated IT security or phishing-reporting address.