People will "disagree" and, IMO, that is why we have laws. To resolve the "moral ambiguity" that some folks have. A system of laws is not a perfect, mind you, but, IMO, its better than nothing. When there are debates on HN about tax avoidance/minimisation, people often claim the problem is with the legislature. Any suggestion of ethics is insufficient; they want laws before they will agree there is any reason for tax avoiders to change their behaviour. In the absence of "moral clarity", laws are helpful.

If one does not want persons other than the recipient(s) to read their mail without permission, is it a good idea to let a third party hold your mail for you such that it can be obtained through legal process by a fourth party without your knowledge. "Tech" companies providing "email storage" would never tell you not to use their "service" as it is against their interest.