> On 22/09/2025 22:14 EEST wt.forsaken--- via dovecot <dovecot@dovecot.org> 
> wrote:
> 
>  
> Hi there,
> 
> I'm testing the new version of Dovecot 2.4 in Debian 13 before upgrading to 
> my customers and I'm having difficult on trying to override the user's quota.
> The LDAP base is from Samba4 AD and having been trying the following 
> configuration:
> 
> auth-ldap.conf.ext:
> ldap_uris = ldap://localhost
> ldap_auth_dn = cn=admin,dc=localdomain
> ldap_auth_dn_password = password
> ldap_base = ou=users, dc=localdomain
> 
> passdb ldap {
>   filter = (&(objectClass=person)(sAMAccountName=%{user}))
>   bind = yes
>   fields {
>     userdb_quota_storage_size = %{ldap:telephoneNumber}B
>   }
> }
> 
> userdb prefetch {
>   driver = prefetch
> }
> 
> userdb ldap {
>   fields {
>     quota_storage_size = %{ldap:telephoneNumber}B
>   }
> }
> 
> 90-quota.conf
> mail_plugins {
>   quota = yes
> }
> quota "User quota" {
> }
> quota_storage_size = 40M
> 
> 
> Since there is no quotaBytes in Samba AD, I'm testing to map the 
> telephoneNumber parameters to override the quota, also I'm just testing a 40M 
> to see how it works.
> Roundcube webmail can see the quota being overriden in its inferior bar, but 
> when I send an email to the user which is above the quota,  the journal log 
> inform "failed to store into mailbox 'INBOX': Quota exceeded (mailbox for 
> user is full)".
> 
> I don't know how to override the quota, since in passdb section I used the 
> "userdb_" prefix but it is not being passed to userdb when I input the 
> "doveadm user ..." command.
> 
> I don't know if I have been clear in my request, but I'd appreciate any help.


auth-ldap.conf.ext files are not supported, unless there is something that 
actually includes these into dovecot.conf, please check `doveconf` to ensure 
that these settings are really there.

Also you might want to check with `doveadm auth lookup` and `doveadm user` to 
see that you are actually getting the quota_storage_size field out from userdb.

Aki

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