Add private note to emails in Inbox
An ability to attach a note (also encrypted, naturally) to one of the emails in my mailboxes, just for personal use in tracking the reason behind a message, or what I have done in relation to any particular email, would be a tremendously useful feature! Please bring us a way to attach one or more notes (preferably with timestamps on when each was made) to any email in our mailboxes! Thank you!

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Joe commented
Yes, this would be a very valuable feature. I just tried searching for something in an older email. It wasn't found, which was very annoying. However, if I was able to attach a private searchable note to the email, then it would make searching far more useful. As it is, the search feature is useless for me. I can't rely on it. I need to be able to add my own reference search info. Please consider this as a very valuable addition! Thanks.
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Philippe commented
Would love to have this as well.
I discovered this feature when testing Hey, and it's a simple and great addition.