encrypted storage on the fly using user's password without storing password on the server

[dovecot.lists at graphyc.io]

Bumping one last time in hope for assistance.

On 18-02-20 6:44pm, dovecot.lists at graphyc.io wrote:
> Bump? Nobody using mail-crypt right now (with user keys encrypted by 
> user's password to work transparently from, say, Thunderbird) who could 
> share their config?
> 
> On 12/02/2020 11:54 pm, Alex Knowles wrote:
>> Hi all,
>>
>> I just joined the list. I've read through the mail-crypt plugin docs 
>> here https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/
>>
>> I'm still unclear (I'm not an expert) about the following: Is it 
>> possible to obtain on-the-fly encrypted storage using the user's 
>> password without the password being stored on the server? Basically a 
>> zero-knowledge solution.
>>
>> Theoretically this should be possible as the user provides the 
>> password when storing or retrieving emails. The above plugin docs 
>> don't make it clear for me whether it is supported.
>>
>> Could a kind clarify? I'd also be very grateful for a working conf as 
>> an example.
>>
>> Best wishes and thanks in advance,
>>
>> Alex.