dovecot quota service for postfix

[James Lott]

> Incase user is underquota, then the email is returned back to postfix for
> processing and delivering email to user mbox, incase user has no
> sufficient quota then dovecot will inform postfix to reject email.
>
> Please confirm if what i mentioned above is correct and that i understand
> correctly how dove-cot policy works with postfix.

Your understanding is mor or less correct, except that postfix never
passes the email itself to dovecot when performing the quota check. It
simply sends a message to the quota policy service asking if the
recipient is over quota. If the recipient is over quota, dovecot
provides postfix with the response configured in quota_status_overquota.
If the recipient is under quota, dovecot provides postfix with the
response configured in quota_status_success. If dovecot does not know
the user, it provides postfix with the response configured in
quota_status_nouser.

> Kindly check my configuration below and advise the missing parts to add...

I don't see anything wrong with your configuration on first appraisal,
but if it isn't working I would recommend you perform the following
troubleshooting steps.

1. Verify the user's mailbox is over or under quota in alignment with
your expectations
     - `doveadm quota -u $RECIPIENT`
2. Test that the quota service provides the response you expect it to
     - `echo "recipient=$RECIPIENT" | nc -q1 localhost 12340`


On 09/26/2015 01:40 AM, Michael Peter wrote:
> Hello,
>
> I am trying to use dovecot quota service for postfix in order set quota
> for some users.
>
> i configure postfix policy service to ask dovecot if user quota is
> sufficient to accept the email or not.
>
> (dovecot in this case acts only as policy server to postfix as it only
> ACCEPT/REJECT email according to user quota, but it is not used to deliver
> email , because postfix will deliver the email to user mailbox)
>
> Incase user is underquota, then the email is returned back to postfix for
> processing and delivering email to user mbox, incase user has no
> sufficient quota then dovecot will inform postfix to reject email.
>
> Please confirm if what i mentioned above is correct and that i understand
> correctly how dove-cot policy works with postfix.
>
>
> Kindly check my configuration below and advise the missing parts to add...
>
>
>
>
>
> plugin {
>      quota_rule = *:storage=1G
>      quota_grace = 10%%
>      # 10% is the default
>      quota_status_success = DUNNO
>      quota_status_nouser = DUNNO
>      quota_status_overquota = "552 5.2.2 Mailbox is full"
>      ...
> }
>
> The above configurations is for all users which is not override by  quota
> rules in  userdb's extra fields in my password file below.
>
> Is the above configuration missing some thing ? i am using mbox format for
> emails storage. do you i have to add (quota= SOMETHING) before (quote_rule
> =  *:storage=1G) and what to do add to make dovecot support mbox quota?
>
> smtpd_recipient_restrictions =
>      check_policy_service inet:SERVER-HIDDEN-FOR-SECRUITY.com:12340
>
>
> service quota-status {
>      executable = quota-status -p postfix
>      inet_listener {
>          port = 12340
>      }
>      client_limit = 1
> }
>
> now in order to configure dovecot specific quota for user named (user1) i
> use passwd-file as follow
>
> user1:{plain}pass3:1002:1002::/home/user1::userdb_mail=mbox:~/mymail:INBOX=/var/mail/user1
> userdb_quota_rule=*:bytes=300M
>
> All other users except users1 should have 1GB storage according to this
> configuration. which user1 will only have 300MB
>
> Please advise what is my configuration is missing and if i need to add any
> thing to run without issues.
>
> Many thanks
>
> Michael Peter