Subject line encryption
Email client Tutanota encrypts/hides the subject line when you send a password protected email. It simply says that the sender has received a confidential email. This seems to make more sense. The whole email including the subject line should be encrypted. I really like how Tutanota does this.

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MC commented
Agree encryption is important for subject line.
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Jason Oliveira commented
I suspect this feature isn't being implemented because it allows meaningful data to be given to governments and other requesting entities, and encrypting such subjects would likely lead to the company being sanctioned in one form or another.
Regardless, it is a security feature that is sorely needed for those of us not subject to targeted government surveillance.
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Peter Wright commented
Yes, I agree that the subject line should be encrypted
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Randolph Stanovich commented
Proton just needs to have the abililty to remove the subject line for all forwarded emails. It is impossible to encrypt the subject line in PGP.