Create Preview Pane to Read and Action an Email Without Opening It
Please add a Preview Pane that allows a user to both read and action (delete, move, mark as read, etc.) an email without opening it. This functionality is available in both Gmail and Outlook and is an excellent efficiency tool.

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Anne commented
Absolutely critical. Outlook has a good interface for this. It helps to prevent clicking open emails that are not safe or activating a 'read' notice to some senders. Can't believe this feature is not built in. Even the hover option only reveals the subject and not the body of the email and the address sending the email. The hover takes too long to load also. A big misstep I think. This is critical. It is enough to give up on Proton even though it is supposed to be safe - this not only feeling unsafe but also annoying.
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notyouanymore commented
We should be able to have an option in the settings of proton mail to preview mail whether it is incoming or outgoing. Some people prefer this privacy. Gmail and outlook have it, but they are not as encrypted as proton mail, so it should definitely have it. It would make the website or app more widely used and should be used in basic services and not required to be purchased.