Setup user specific mail quotas with LDAP

Intro

The official Dovecot wiki should be your go to for setting up mail quotas, but here I am describing how I setup mail-user specific quotas to work with my LDAP environment.

Setup

I included a quota configuration for user_attrs in my dovecot-ldap.conf.ext consisting of the following

user_attrs = mailHomeDirectory=home,mailStorageDirectory=mail,mailUidNumber=uid,mailGidNumber=gid,mailQuota=quota_rule=*:bytes=%$

The quota limit is in the mailQuota field: mailQuota=quota_rule=*:bytes=%$

Once Dovecot has been restarted with the above quota limit, we can then add the mailQuota attribute with a value using a preferred metric unit. For example, a mail user record might have a quota limit of 250 MB.

mailQuota: 250MB

The above quota is user-specific so this will end up overriding the global quota.

Verify Quota

I use a lot of aliases to save time, so putting this in your user profile is recommended.

alias quota='doveadm quota get -u $1 '

$ quota johndoe
Quota name Type    Value  Limit                                             %
User quota STORAGE     0 256000                                             0
User quota MESSAGE     0      -                                             0

See the doveadm-quota wiki for additional options.