Recently
MrKable has shared a very useful in my opinion service of notes
https://privnote.com/When you create a note, you get a link to it, which you can transfer to a person. And when reading the note, it self-destructs :), of which the recipient is obviously warned. That is, if the contents need to be saved - then it is necessary to copy it before closing the window.
Plus it is possible to send a notification to the specified mail about reading the notes.
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It is an interesting service :)