I was fighting domain quota for a long time, too. And I was never really successful at it, because group/domain quotas have multiple problems, and domain quota recalc is just one of them :)

After a long trial and error I ended up implementing XFS project quotas.

On 14/03/2019 15:14, Peter Hudec via dovecot wrote:
Hi all,

I’m a little bit confused about the quota plugin in dovecot and fighting the 
the issues the people had years ago. I spent readingg the old archives and the 
mailing list for 3 days and not able to get work some features. Single user 
quota is fine and simple, the group quota /for example domain based/ makes me 
unhappy.

Setup: CentOS7, dovecot comunity repo, dovecot 2.3.5


1) domain quota recalc
domain quota recalc do not work properly. The domain qouta usage is worknig 
well, hwhen receiving/deleting mail, generaly if the operations are incremental.
But if I run domain quota recalc, the doveadm is setting the domain quota after 
each user calculation, that means the domain quota is set to the last user.

2) multiple quota roots and rules
According the documentation, there could be possible, from the sample 
configuration file

# Multiple quota roots are also possible, for example this gives each user
# their own 100MB quota and one shared 1GB quota within the domain

plugin {
   quota = dict:User quota::proxy::quota
   quota2 = dict:Group quota:%d:proxy::quota_domain
   quota_rule = *:storage=1024M
   quota2_rule = *:storage=2048M
}


But If I run
[TEST] r...@mail-store01.test.host.sk: /etc/dovecot # doveadm quota get -u '*'
Username            Quota name  Type    Value Limit                             
                                    %
tes...@test.host.sk User quota  STORAGE     1  1024                             
                                    0
tes...@test.host.sk User quota  MESSAGE     1     -                             
                                    0
tes...@test.host.sk Group quota STORAGE     7     -                             
                                    0
tes...@test.host.sk Group quota MESSAGE     3     -                             
                                    0
tes...@test.host.sk User quota  STORAGE     7  1024                             
                                    0
tes...@test.host.sk User quota  MESSAGE     3     -                             
                                    0
tes...@test.host.sk Group quota STORAGE     7     -                             
                                    0
tes...@test.host.sk Group quota MESSAGE     3     -                             
                                    0

The idea is to have overall domain quota, but for user able to set it’s 
personal quota.

        regards
                Peter

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