I don't know for the rest of the world, but in France you can indicate your mail being private by adding a prefix to the subject of your mail with "Privé". Then

I don't know for the rest of the world, but in France you can indicate your mail being private by adding a prefix to the subject of your mail with "Privé". Then the "secrecy of correspondence"[1] apply. Some company restrict the usage of private messages using the company-provided mail, but it is not the default case. The company cannot access those messages without your consent or without a suspicion of a crime (like a leak of data). [1] https://en.wikipedia.org/wiki/Secrecy_of_correspondence https://en.wikipedia.org/wiki/Secrecy_of_correspondence Source in French with some court's judgement : https://www.arobase.org/entreprise/email-personnel.htm https://www.arobase.org/entreprise/email-personnel.htm