Best mail encryption solution for per-user

[tai74 at vfemail.net]

Hai,

Do you have advice about Dovecot plugins for mail encryption:

https://wiki2.dovecot.org/Plugins/MailCrypt

https://0xacab.org/riseuplabs/trees

I like NaCL based encryption but the MailCrypt plugin is better  
because it's maintained by Dovecot developers (is this correct?)

Hard to understand MailCrypt docs so may I ask, may I provide per user  
encryption? I don't like global because I want every user to have  
different encryption based on their password. But I don't see the  
useful of per-folder encryption. Docs for TREES are easier to  
understand it will work on a per-user encryption using the user  
password to decrypt the needed keys.

How about indexing? Does native fast Dovecot indexing must be turned  
off for one of these or both? Is this a big performance hit? And how  
to turn off indexing on a per-user basis?

Thank you so very mcuh


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