Office 365 adding auto BCC to inside email

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Occasional Contributor

Dear Friends, I need a help to solve this issue. One of my company employee is getting a issue with the BCC email. Whenever he is sending email with CC, automatically few BCC emails are created. All BCC email are on same domain emails, but email id on each times. There isn't any BCC rules and not able to stop it. BCC only visible in mobile outlook and not in PC outlook.

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