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Technology
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I had assumed their reasoning for not taking that approach might be related to metadata at rest, but it seems they don't use "zero access" encryption for metadata even at rest so I have no idea what technical justification they could have for not supporting IMAP with PGP handled by the email client. The fact that they restrict bridge access to paying subscribers only doesn't help them avoid lock-in impressions either.
Great find, even worse than what I was thinking. Like you I was also under the assumption they applied some kind of encryption to all metadata as well.