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It can’t be default because the protocol is degradable by design. I would agree that they could advocate a method to harmonize all COI-aware IMAP servers. But it’s hard to get E2E encryption in a heterogeneous, legacy environment.


Support for S/MIME encryption is pretty ubiquitous at this point, right? There are practical issues with CAs, but nothing insurmountable.


Not even close to ubiquitous.




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