Don’t see emails from a specific sender for some users (Admin centre Exchange)

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Hi Dmitri Alexandrov

Thank you for reaching out to Microsoft Q&A fo

Based on your description, since specific users are missing emails without any Message Trace logs, the behavior is likely occurring before reaching your tenant.

1. Top Probability: Sender-Side Suppression (Sender Service)

The most likely cause is that the Sender Service has placed the affected recipients on an internal suppression or bounce list following a previous delivery failure.

• Partial Impact: Suppression is applied per-recipient, explaining why the domain works for others but fails for specific users.
• Absence of Logs: The sender drops the message internally before transmission, so it never reaches Exchange Online.

In this situation, I suggest you should contact the sender's support team to review their suppression/bounce list and request removal of the affected email addresses.

2. Advanced Message Tracing

If you suspect the emails are reaching you but are hidden in standard reports:

• Navigate to Exchange Admin Center > Mail flow > Message trace.
• Start a New trace with Sender: *@senderdomain.com (wildcard is important) and leave Recipient blank.
• Select Extended report type and a 48-hour range.
• Download the CSV and filter for affected users.

If the affected users are truly absent, Step 1 is almost certainly the cause.

Kindly let me know in the comments for further support.

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