quota-status for outgoing mail (Dovecot/Postfix)

[infoomatic]

If you are not restricted to using dovecot and postfix only, I suggest
having a look at policyd "cluebringer" - from https://wiki.policyd.org/

Works great to set quotas per user or per domain.


On 06.12.20 21:13, Peter Folta wrote:
> [Dovecot version 2.3.11.3 (502c39af9)]
>
> Hi all,
>
> I’m using Dovecot’s quota-status service to let Postfix check the
> recipient’s quota before accepting emails following the guide
> here: https://blog.sys4.de/postfix-dovecot-mailbox-quota-en.html
> <https://blog.sys4.de/postfix-dovecot-mailbox-quota-en.html>. This
> works well for inbound emails.
>
> I would like to set up something similar for outbound email, i.e. if a
> user is over quota, they should not be allowed to send new emails. At
> the moment, the setup is in a bit of an inconsistent state: Users that
> have exceeded their quota are still able to send outbound emails but
> saving them in their Sent folder will fail leaving them without a copy.
>
> I have tried using Dovecot’s quota-status in Postfix’s
> smtpd_send_restrictions but didn’t get this to work. A quick look at
> the Dovecot source code seems to suggest that the quota-status plugin
> is only checking the recipient
> address: https://github.com/dovecot/core/blob/master/src/plugins/quota/quota-status.c#L135-L146
> <https://github.com/dovecot/core/blob/master/src/plugins/quota/quota-status.c#L135-L146> and https://github.com/dovecot/core/blob/master/src/plugins/quota/quota-status.c#L109-L111
> <https://github.com/dovecot/core/blob/master/src/plugins/quota/quota-status.c#L109-L111>.
>
> I suspect it’s not possible to use the quota-status service to control
> outbound email but thought I’d ask to confirm. I’m wondering if
> there’s a different way to achieve this?
>
> Thanks
> Peter