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Exchange Online: Some users receiving spam email from unknown address but have no message traces log
My some users received spam mail "from: Microsoft Account Team(email address removed for privacy reasons) Subject: Warning: verify your email address. and in body: some text content and links." ...
Without having the full message, we can only guess. If you are having doubts, submit it to Microsoft for analysis: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/admin-submission?view=o365-worldwide